Misfiring at low engine RPM's

[twangboy]

i have an automatic 94 dodge spirit 3.0. when its in neutral and i floor the gas, there are no problems. in neutral the cars runs perfect. when i put it in drive, i need to accelerate slowly. if i give it a generous amount of gas, it feels like the engine stops pumping for a brief moment till i release the pedal which then the engine recovers quickly and is fine. i replaced the plugs, wires, fuel filter and pcv valve. i have been told it may be the o2 sensor. i did the key trick and it told me 12,55. that 12 means the computer has been recently disconnected. i dont think that means anything. this problem only occurs while giving it gas in low rpms in first gear. 2nd and 3rd have no problems at all. i checked all the vacuum hoses i could find and replaced one. im sure it helped, but it still has the problem.

a side problem. while in drive or neutral ( i dont have a speaker box in my trunk) every 4 - 5 seconds my car increases its rpms ever so slightly when i am holding the break and not moving. when it does this, the lights dim slightly. i dont have the wipers going so that high drain device isnt doing it. also my lights are off and radio is at reasonable levels. any thoughts.

[DodgeDaytonaV6]

Check the O2 sensor and IAC(Idle Air Control) Motor. Could also be fuel pump, one of a million relays or sensors, ect. One other question: Does it do this once its warmed up or only when its cold?

[twangboy]

it does it always. warm, cold, it doesnt matter.