I have a mustang 05 runs great only issue is when i step on the gas it takes forever to catch speed. It has bo exaughst system on it. Idk if that can be the problem but i dont think so. Sometimes ill push the gas and itll druve great goes fast quickly but its only happened 3 times in 4 months. Most the time i push the gas and i can probably count to 50 before it kicks in to full speed. Has any one else had this problem? If so how did they fix it?

 

This isn't likely a 'oh, that's the framidangle part, just replace it' thing. There's a few things to look into that can cause it. Read all this, then proceed as you desire/figure/want/?, I'm not yer boss.

First, acquire shop towels, a big, discardable terry towel, a small bucket, battery terminal cleaner spray (the yellow if clean/pink if not kind), a terminal cleaner tool, nylon brushes, small picks, battery washers, a tube of dielectric grease, throttle body cleaner, fuel filter, spark plugs, MAF cleaner, and whatever tools needed to access the latter three items on the car.

Park car in a place that you won't mind it getting messy under the car.

Remove the negative terminal of the battery. Remove the positive terminal. Remove the hold down clampage. Remove the battery. Remove the battery tray. Clean the area with that spray, using the bucket with some water to rinse off all the pink and keep doing so until there's nopink. Firewall, inner fender, frame rail... all of it. You're removing battery gunk, and you want it gone.

Once that's done, scrape and pick and clean and spray and repeat with the terminals. Get the corrosion off, and make sure that pink from the spray ain't happening. As much as humanly possible. Mostly the positive terminal, but both. Use bucket to rinse. Be sure to swap the water frequently during all this, btw.

Now clean the tray, same way. Clean the bolts, same way, and anything else to do with that battery, including teh battery itself. Yes, you can wash it. Top to bottom and underside. Clean. Then clean off the battery terminals with the tool.

Reassemble the battery tray in the car, put battery back in, DO NOT CONNECT. That comes later.

Now, replace the spark plugs. There's plenty of videos regarding that.

Replace the fuel filter. Plenty of videos regarding that as well.

Clean the throttle body. Plenty...

Clean the MAF. Ple...

Ok, done with that, time to connect the battery. First, put on the battery washers. Next, first positive then negative terminals: Slather dielectric grease on the bottom of the terminals, then put the terminal on the post, tighten, Slather the remainder of the terminals in the grease. Yes, it's not pretty, and it's sticky messy, but those battery terminals will never corrode again if you do it, and there can't be any 'dirt on the top of the battery causing a short' happen if you do this as well.

Now. This is optional, but I'd recommend you take the alternator connections off and put some dielectric grease on/in them to help them from getting corroded, but that's just me. A definite 'if you wanna' thing. Just prevents charging issues, honestly. I did it with mine, solved all those electrical gremlins.

Now to train the engine computer. Get in the car. Turn the key on, but DO NOT START. Depress the throttle pedal slowly over 5 seconds until it hits the firewall. Release the pedal. NOW start the car. Go drive in normal street (NOT freeway/fast) traffic for 10 miles. There. Tune up complete. Car will hopefully thank you by running nice.

And that's a tune up.

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Of course, all that could not be the problem you could have a plugged up catalytic converter or two, and there's only one remedy... gut the cats. No, wait, that's not legal. You'll have to replace them. The only way to tell besides taking them off and having a look inside directly is to tap on them and see if they rattle. If they do, the material is bouncing around in there and the cat is gone. And it's blocking your exhaust. Which can indeed cause intermittent issues like this.

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And even all that may not be the issue, it may be wiring, a bad computer, maybe the transmission is ticked off... I just listed the 'least costly, easier to do' items and past those you're getting into expert/specialty territory, perhaps.

Manual transmission could be the clutch slipping, maybe...? Really think that'd be all the time, not just sometimes. Automatic transmission can certainly be an intermittent thing. Maybe there's a TSB on that... I found this one, but not sure it applies.

I hope some of this helps. I maybe missed something too, others will chime in soon. Good luck, and welcome to the forums!