2005 GMC Envoy tune up sorta

2005 GMC ENVOY
151,000 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
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ROGERLHOWE
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I replaced 4 easy to get to spark plugs. started up great. Changed last 2 under firewall and when I went to start it I have to pump the gas pedal 6 times to start and it quickly dies. Any suggestions because I am confused. If problem is in coils does it need more gas to start?? I am thinking fuel filter????

Please give me a possible direction

Roger
Aug 16, 2014 at 4:10 AM
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WRENCHTECH
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Let me clear one thing up for you. Pumping the gas pedal on a fuel injected car does nothing but exercise your foot.

The first thing you need to do is test the fuel pressure using an accurate gauge.
Aug 16, 2014 at 6:27 AM