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fuel delivery issue possibly?

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Old 07-05-2012, 07:25 PM   #1
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Default fuel delivery issue possibly?

So i have a 2000 chevy 5.3l, swapped into my 79 chevy 4x4.

runs about 50-60 psi depending on the vacuum of the engine.

I just recently started having a missfire, not bad enough to throw the check engine light on.

I was thinking it may be because i have a exhaust leak before the o2 sensor for some time now and it may have fouled a plug.
NOT THE CASE. i pulled both sides out and they all looked new still ( only month old AC delco's)

Im not sure where else to go with this now, i even watched my o2 data..

what i am seeing is a b1s1 o2 is say +3.0% to 7%.. roughly.
while b2s1 o2 is say -.05% to -4% roughly.

i swapped a new o2 in the drivers side and it made no difference.

Does anyone else have any pointers on where to go about next? maybe a stuck injector? clogged? im not sure.
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Old 07-05-2012, 08:02 PM   #2
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i actually do have a DTC>
idle air control system RPM higher than expected.

sprayed around intake gaskets, no change
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Old 07-06-2012, 06:23 PM   #3
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still no solutions?
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Old 07-06-2012, 06:23 PM
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