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Misfire on acceleration from idle to 2000 rpm

Kev58980

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V6 ecotec, auto, 350000km, engine misfire on exceleration from idle to about 2000rpm, engine feels like it is going to stall and the accelerator has to be pushed firmly. Then excelerates fine. No noticeable misfire at speed.
Elect or fuel??
Recently had Crank AS and Cam AS
Replaced. Regularly serviced.
 

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Could be either fuel or ignition.

I'd start with plugs/leads and coils. Fuel wise new fuel filter and try running some injector cleaner. What condition is the air filter in? Have you tried cleaning the MAF?

From about 2000rpm onwards or when it starts to run better is the point under high load the PCM goes into Power Enrichment Mode, basically that is when the air fuel ratio's go full rich to make max power. At the lower RPM levels the PCM is still running in closed loop mode and trying to maintain Stoichiometric ratio (14.7:1 AFR). If you have a sick injector and and the cylinder is running lean it will break down. If you have poor spark it will break down.
 
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