Today I had a series of shudders or stumbles when driving the car. I was going about 45, up a hill, and I gave it slight gas. I am not sure of gear as it’s an automatic. It has 95k miles and is a 2008 GT convertible. No CEL was thrown and I just ordered a reader to check codes and do some real time monitoring. It did it again, similar, but less pronounced, again under low throttle later. The car had been driven about 15 minutes. Any ideas what to check or scan for?

 

I had come to a stop sign. Stopped, turn right onto a 45, going down a hill probably coasting, get to up hill, give very slight throttle to accelerate up hill and it happened. So I think I was coasting beforehand.

 

I've been having the same thing happen in overdrive going up a hill, will stumble a little but no CEL.. otherwise won't do it under normal conditions. I'm thinking maybe a fuel filter or throttle body might be dirty.. have you changed out the plugs yet? Mine are due, might also be the problem..

 

Not sure on plugs, I have only had the car a couple of months. I should probably do all the basics beyond the oil change. Clean MAF and TB, replace fuel filter and plugs, what else?

 

One of my coils went on me at around the same mileage, but threw a code.. might be starting to flake out.?

 

Drove again today, nothing major. If I’m cruising along, speed doesn’t seem to matter and I give it medium throttle I feel a brief rumble behind me like the exhaust or trunk area. Then the power kicks in. Still no codes or pending codes on the OBD reader. I will attack the easy stuff then plugs and coils.

 

Changed the fuel filter, cleaned MAF and TB today. It ran much better than before afterward. I have plugs but may put them off since the cleaning seems to have fixed the majority of the issue.

 

I paid to have the plugs replaced today. They broke 3 following the TSB. I am glad to have that done and she is purring like a kitten now!