Need help on a 1995 Chevy Suburban. It will die at idle when it's up to running temp and in gear. I have to pump the gas peddle to keep it from dying. Just did a tune up and throttle body cleaning to see if that would fix the issue. No joy. Cap and rotor, plugs, wires, fuel additive. It's fine in park or neutral, but as soon as I shift into reverse or drive, it dies. HELP!!!

It sounds like the motor's tick over is far to slow when the car is put in gear if the tick over is say 750 rpm out of gear then it stalls when you put it in gear lift the tick over up to say 850 rpm the best way to set this up is have a friend sit in the car, warm the motor up, then get your friend to hold the foot brake hard on and put the car in gear, if it stalls bring the tick over up (in gear) till it dont stall,,,but hold the brakes hard on when your doing this,,,getting run over is not a nice thing to hapen to you and it wont make your day? you should feel a dit of a thump when you plop it into gear so hold the foot brake down when you do plop it in gear every time you do so, it saves the transmishion getting a thumping, all the things you have done to your car so far have only done it good, but why not change the oil and filter as well and know you have done the full monty on your car, and it wont need another service for another year or so?????