408StrokerSS

iTrader: (2)

I built my lt1 about a yr ago..ran the car for about 4 months with little bugs mainly in tuning...then cold weather came and after a month car started only starting when it wanted to ....and now even in warm weather doesn't want to start only maybe once or twice...when it does actually start ..it runs like a champ then while its running after a 5 mins..10mins ..sometimes 30 mins it will start to fall on its face ..misfire..spit.sputter..backfire and just die...then will not restart..just crank and backfire...i unhook the batt. for a day or so ..and after several attempts it will sometimes restart..when it dies i get no CEL..looking at the scan tool while its running i cannot see anything wrong....checked fuel press and getting 50psi...

I have the delteq coil ign system installed so i even went back to opti to see if it was a prob with delteq and still same prob.. I have changed the opti with 3 gm units to see if that was the prob...no luck...changed every sensor except IAC and MAF ...but again both seem fine on scan tool readings...Vats is bypassed through tune as well as air/egr valve...new delco 02 sensors..

Any help would be greatly appreciated guys!

95z28onjuice

iTrader: (-2)

Have you checked the ICM? you said you replaced every sensor but the 2 listed. i just wanted to check. when it wont start how hot/cold is the spark?