peebzies

Truck has been good on cold start up then when warm it will sputter and almost stall under acceleration. Also when warm idle is rough in park but fine in drive. Finally threw codes for lean banks 1 and 2. I did these to try and fix it: cleaned maf, cleaned tb, changed intake manifold gaskets, changed fuel fillter, change spark plugs and wires. Truck has stock intake, long tube headers, no cats, and exhaust. Also has pcm tune for egr delete and no rear o2 sensors. could it be weak fuel pump? Thanks.

2xLS1

iTrader: (25)

A fuel pressure gauge on the rail is the only way to tell.