1994 GMC S15 Idle issues

1994 GMC S15
120,000 MILES
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DUSTIN1996
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I am having issues with the idle and it keeps shutting off at idle in drive, idles really rough , all the timing parts have been changed, has white smoke when running, dies down the smoke after warms up, dont know how warm cause cant get the temp guage working, any help would be appreciated, i am taking a sjot in dark that its possibly the head gaskets or intake gaskets.
Jul 15, 2013 at 1:19 PM
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HMAC300
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what engine? scan for codes and check fuel pressure first.
Jul 16, 2013 at 6:17 AM
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DUSTIN1996
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It's a 4.3 W code engine, so I am guessing its the CPI from what I found researching it. Ok thanks will do and see what comes up with it.
Jul 16, 2013 at 8:05 AM
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HMAC300
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it should be 55-61 psi unless it's atbi unit which should be 9-11 psi.
Jul 16, 2013 at 10:24 AM
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DUSTIN1996
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Ok, we'll I checked the pressure and its way low for CPI , it came out at about 30psi, and I pulled the top plenum off and there's quite a bit of raw fuel sittin on top of lower enum, and pulled the injectors out and there's not a single o-ring on any of them, so ordering a set from Rockauto and gonna change the fuel cap also, so will see if it comes back up to normal when that's done and see if that remedies the issue, will keep you posted, thx
Jul 22, 2013 at 10:49 AM
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HMAC300
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it's probably the fuel pump the orings should be replaced if there were none but check inside the lower intake for them as they could have slid off. the pressure wouldn not be affected if truck wasn't running as it can be taken with just the key on.
Jul 22, 2013 at 12:00 PM