What would make the rpm jump(flicker) ?
I replaced mass air flow, distributor,optima battery,radiator,exhaust,no leaks on exhaust,just got it put on,new wires,distributorcap ,rotor,iac motor,hoses,plugs nkg v,ignition switch,o2 sensors, egr, engine coolant sensor,always change oil, new short ram air filter,,all new vaccum line hoses, fuel filter, two much money and two many to list. It seems every time I stop or have the ac on Ithe rpm flikers and i feel the engine stutter,till I gun the gas pedal feels sluggish on take off and first thing in morning. I been working and searching on the net and buying parts related to this problem and still no luck. its bugging me and I hate to ask but i dont know what to do. Lat code it through it was p 170 fuel trim malfunction. I traced to mass air filter or exhaust leak i replace maf sensor and today just got my header put on after four months and it still doing that sluggish feel. I replaced the iac motor thinking it was the problem. I' pretty sure its not the throttle position sensor. cleaned throttle body. I 'm clueless any suggestion i'm breaking the bank and no lucjk everthing i changed and replace on car but engine and trans which will be in the future. I do tune up ever since i got it last year. I have come a long way. I love this car to death and have so much work and fun with it. I really enjoy this board and the people on here and its so amazing at what you all do to these cars. I love it. Soory to nag but if you could maybe steer me in the right path again. Thanks!