immediate stumble upon acceleration

[black magic]

i have a 3in maf lt1, 340 walboro fuel pump 43# injectors, 3in downpipe with external wastegate, extender extreme chip, maf translator gen 2. when i accelerate my car just stumbles and the check engine light goes on then turns off, and no MAL on scanmaster please help!!!!!

 

[scgnx2]

post your sm readings at idle (warm) would be a good starting point.

 

[salvageV6]

Check your volts when it starts to stumble.

Check to make sure your chip is seated properly as well.

Verify all your settings are correct in the GEN II.

 

[TLIMITED]

Check O2 readings.Maybe fouled.

 

[GNRick]

Maybe power wire from battery shorts out on frame near the starter?

 

[czimpel]

Mine was a fuel pressure fix. Sat under the hood and adjusted the pressure up and down until the stumble was gone. I also have 120 lb injectors, which Eric from TT said they were very picky on fuel pressure. You don't have these, but worth a shot.

Sorry, didn't read the full post(LAZY) I didn't have a SES light.

 

[Bescurred]

Maybe power wire from battery shorts out on frame near the starter?

Same thing happen to me once...I only caught it b/c I was looking over the car in the dark and saw sparks fly!!

 

[TurboBuRick]

X2 Trace the positive battery cable down to the starter. Particularly by the headers.

Rick

 

[black magic]

put in new TPS, and02 problem fixed thanks guys