2000 GMC Jimmy

2000 GMC JIMMY
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MIKE OCK
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Engine Performance problem
2000 GMC Jimmy 6 cyl Four Wheel Drive Automatic
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i have a 2000 gmc jimmy that has been acting up as of late .When you drive it for the first time in the day it seems to hesitate and feels like it is running out of fuel.When i step on gas it has a hesitaation and then it kicks in it runs fine on highway or for the rest of the drive but when it sits for about an hour or so it does it again i have had it put on diagnostic machine and it was found that the tps had to be replacedbut did not make a difference.I replaced map sensor still nothing ehen it was diagnosed they told me my fuel pump was working fine also which i thought might have been another cause i have noticed a white yellowish milky substance in the the tube that comes from the passenger valve cover that goes to the air intake plenum is this my problem and what would cause this to happen the truck only has 157000km plz help. Oh yeah also did afuel pressure test when it started to act up pressure styesd the same it feels like it wants to stall when this happens also
May 7, 2008 at 9:25 AM
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RHALL77
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check your fuel filter. You may have good fuel pressure but not enough volume. You can have someone hold the fuel pressure gauge while brake torquing the engine have them open the relief valve. if it stalls or runs rough, you know its the fuel pump or filter. also another thing you can try is disconnect the cat converter and drive it. if you have power then you know that will have to be replaced.
May 7, 2008 at 9:56 AM
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MIKE OCK
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i have also changed the filter but how am i suppose to dis connect converter iwas thinking it was that also but no one even suggested that until now
May 7, 2008 at 10:09 AM
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RHALL77
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disconnect the exhaust at the exhaust manifolds
May 7, 2008 at 10:24 AM
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