B Stang

Hi guys. Looking for a little help from the collective wisdom of the forum. I've got a 99 GT w/ manual trans that's basically stock. I've got a general engine question which is why I posted here instead of the specific SN95 V8 section. My engine has developed a problem of having zero low end power. It starts to chug hard if I'm cruising down the road at 60-65 in fifth and need to climb a hill. I'll have to shift down to 4th. It will barely accelerate at all until I'm at 2200 rpm's. I'm not throwing a code and the CEL isn't on. It doesn't feel like an ignition problem on one cylinder because it's chugging so hard. I'm leaning more toward a sensor on the throttle,, cam, crank etc. but I don't know. I've cleaned the MAF sensor, throttle body, installed a new air filter, and new spark plugs. Let me know what ideas you guys have. Thanks for the help.

SpectreH

B Stang

Perhaps, I've got about 13,000 miles on that filter, so you'd think it would still be good, but it's a cheap thing to try.

SpectreH

Yeah, I would not expect it to clog in just 13,000 miles.

SilrBult

I would do a compression check. I don't know the specs for your engine, but I would expect at least 120 psi and all cylinders should be within 10% of each other. If compression is good I would look at the catalytic converters. One or both may be clogged. Bad plug wires usually cause the same type of hard ignition miss as a bad plug.

wanted33

And just for giggles, while you changing out the fuel filter you may want to clean your MAF, and throttle body. Can't hurt. Good luck.

Glenn

I would also suggest cleaning the throttle body