engine running realy weak and stalling

[88iroc]

I had a problem with my 88 iroc stalling out so i took it to the mechanic and he told me that my problem was a bad fuel pump, i got that fixed but now the car seems to drive even worse then wen i first brought it in. not only that but now wen i push the gas pedal down the car preaty much dies, it works better if i just gently push it down a lil bit but thats it, It wont even go over 30mph. does ne1 hav ne idea wat could b wrong wit it?

[4onFloor]

sounds like a bad tps. you can check it yourself if you have a voltmeter. with the ignition turned on, probe the center wire on the tps connector. with the throttle closed there should be 1/2 to 1 volt. with the throttle wide open there should be approx. 5 volts, then slowly open and close the throttle. the readings should be a smooth gain in voltage as the throttle is opened, and vise versa as you close the throttle.

[89IROC&RS]

could be. check your sparkplugs too, if you were running lean you might have cooked them, and they could need tobe replaced. maybe the O2 sensor as well.