I took my 95 3.8 to a friend to get the codes read, and got code P0302 (misfire detected in cylinder #2). I checked the coil for spark spark plug #2 and found that the terminal was all rusted as well as the inside of the spark plug wire boot, so I changed the wires and the coil and I haven't had stumbling problems at 2k rpms since. One other wire besides the #2 plug wire was cracked and it looks like some one tried to fix it with electrical tape...oh and I changed the fuel filter too. The car still shakes a little when going to 3k rpms, but passing 3k rpms it seems fine, was wondering what that could be. I got these two other codes along with the first one I mentined, they are P0147 ( heater circuit malfunction for o2 sensor 3 in bank 1), this car has 4 o2 sensors (1 at each side of the exhaust manifold, 1 before the cat and 1 after the cat) is it the one right before the cat. And code P0108 ( manifold absolute pressure sensor or baroetric pressure sensor input is higher than expected for the current operating conditions) . Thanks

 

O2 sensor you mentioned is the one after the cat. I would check out your MAP sensor for the other code. It is located on the passenger side of the intake manifold towards the back of the engine.

 

I would have to say the misfire is the fuel injector for cylinder 2 so you may want to check those