I am a newbee need help,i have a 2002 gran prix gt, with 167,000 mi. car started stalling going down the road,changed out the MAF,fuel regulator; now it's worse,runs great till it worms up.then the fun begins,step on the throttle it dies,let off,it comes back in.if I play with the throttle i can work it out sometimes,any thoughts would be greatly appreciated!!!