hope some body out there can help me . i have a 90 lumina euro with a 3.1 and it will start and idle with no problem but if i let it idle for a few minutes when i tip the throttle it sounds like its starving for fuel . have replaced; timing chain,fuel pump,map sensor,tps,and crank sensor. have checked ignition, fuel pressure,have pulled injectors and flowed them. even replaced the ecm. G.M tech support doesnt have a clue . i am hoping someone out there has run into this problem and can help me out with this . any help is welcome thanks.