01 GT Hesitation/sputter at 40mph+
Okay guys, forgive me if this has been covered, but I've got an 01 GT, 5 speed. Great car, only 68k on it, the motor supposedly has only 30k because the original blew up, so the guy I bought it from had an 02 motor swapped into it, which from what I understand are pretty close to the same. Anyhow, i had this issue once before. When I lay on the gas, above 40mph, the car starts to hesitate, sort of jerk and bog down. Only if I get the gas pedal more than halfway down. It was doing this to me about a month ago and I was lucky enough for it to throw a cylinder 3 misfire check engine light. so I switched all 8 ignition coils, all 8 plugs and that solved the issue. Shortly after, I changed the fuel filter, did a fuel injection cleaning, and cleaned the K&N filter. A couple days ago it started doing the same thing again. At first it was only above 90mph, then 80mph, then it dropped drastically to 40mph. When I pulled out the plugs the first Time I changed them, the parts that screws into the block were covered in oil. I haven't had a chance to pull them and check again, so I'm not sure if that could cause this issue. I also replaced the pcv to throttle body hose due to it collapsing at high speeds and kiing the motor, which had to be a ford part because it's a hard plastic line wrapped in a foam sleeve. Another thing is that I smell exhaust really bad when I lay on it. Normally i would only smell that if I punched the gas around 80+ mph. Now I'm getting it around 40-50 mph. Any help from you all would be greatly appreciated, thank you in advance. And my apologies if this has been covered.