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My 2003 gmc safari will start and idle fine but as soon as you hit the gas it bogs down. what could be the problem?

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You have to check the fuel pump of your 2003gmc safari.Check for dirt's that can be found and then adjust your fuel pump idle . Sometimes you have to use the choke if it still stop.

Posted on Jul 28, 2009

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I have a 1994 gmc safari.It seems to have a smooth idle at times


Im not sure if you got it fixed yet! It could possibly be idle air control valve. But here some more suggestions! I had a 94 Safari van 4.3 liter I was working on for about three days and I finally figured out what was wrong with it. It would run fine for a couple minutes and as soon as I hit the gas and let off it would surge, but anyways I ended up changing the distributer, after the fuel pump and filter, mass air flow sensor, egr valve, idle air control valve, map sensor, and ignition module. So that might sove the problem if you were on the same track with it as I was. Hope this helps ya!

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1 Answer

No power when hit the gas


The fuel presure should be at least 60- 66 psi key on engine off, and then drop some when started, if it doesn't go any higher than 50 psi that would explain your backfire concern. If it is low then the fuel pump is weak. I have also seen soot on the little wires inside the Mass Airflow Sensor cause a concern like this.

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