Hi all,

Ive been having this issue with my 99 Suburban 5.7 that I cannot seem to remedy. I get a misfire and flashing check engine light under heavy acceleration. It will happen past 2700 rpm when I am merging onto a freeway or going up a steep grade. Once the truck is at speed and in 4th, it will go away after about 30 seconds. It will happen again if it downshifts. Long term fuel trims at idle are around 7 for both banks. Compression test on #7 was 160psi. Idle fuel pressure around 46 psi. So far I've replaced:

• Distributor (CMP adjusted to +/- .3)
• Fuel Pump/ fuel filter
• MAF Sensor
• Crank sensor,
• TPS
• MAP Sensor
• Plugs/ Wires/ Coil
• Injector Assembly.

Any input would greatly appreciated. I know that there are a few threads with the same issue, but no solution has been found for my case.

Thanks.