91 mustang gt help???
 

ok i purchased a 91 mustang gt 5.0 aod when im drive in 3rd around 35 or 4th around 45 im at around 1000 rpm the car stutters an jumps back an fourth a bit it also sounds like its missing a bit if i just rev it up to 1000 rpm after driveing for about 15 20 mins the cel wil come on an through code 91 12 33 and 41 im pretty sure i need to replace the 02s the egr valve is off with a block off plate but i still have the sensor hooked up so it wont through a code it has msd cap msd wires autolite copper core plugs gapped at 40 not sure where the timeing is i have no light to check i run 93 octane fuel can anyone give me a idea as to why im jumping??? i will greatly appreciate the help thanks if you need more info to help diagnose the problem let me know

also the car has a shift kit in it dont know if that will matter or not

is your tv cable hooked up? that rpm sounds really low for the auto, I don't remember exactly what my auto ran around those speeds but I believe it was two too three hundred more rpm's

its a miss it does it at idle too ive notice i have a really bad leak from my header im get it fixed an then try an figure out the miss