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Running rough on cold start

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Old May 12, 2013 | 09:52 PM
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88 f150 4.9l 5speed
185k miles

Truck is missing for the first few minutes it runs, but then runs just fine after that.

Complete tuneup
numerous sensors changed

Any ideas?
Last edited by Crowder; May 13, 2013 at 07:10 PM.
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Old May 13, 2013 | 06:32 PM
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Pulled codes again.

CM 34
KOER 41
Last edited by Crowder; May 13, 2013 at 07:11 PM.
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Old May 14, 2013 | 06:30 PM
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Nothing?
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Old May 14, 2013 | 07:28 PM
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code 41 system always lean. Hows the fuel pressure and how about vacuum leaks?
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Old May 14, 2013 | 07:43 PM
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Fuel pressure steady at 50 lbs. No vacuum leaks. Every piece of vacuum line has been replaced to major components. I've removed the smog pump and capped the lines. Could this be the reason?
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Old May 14, 2013 | 07:56 PM
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How old are the oxygen sensors?
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Old May 14, 2013 | 07:59 PM
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Originally Posted by sylver91
How old are the oxygen sensors?
Less than 3 months old

Only one o2 sensor
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Old May 14, 2013 | 08:02 PM
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Thats right, I couldn't remember if it was 1 or 2.

Only other thing I could think of might be the MAP sensor.
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Old May 14, 2013 | 08:08 PM
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Originally Posted by sylver91
Thats right, I couldn't remember if it was 1 or 2.

Only other thing I could think of might be the MAP sensor.
Also been replaced
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Old May 14, 2013 | 08:09 PM
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Originally Posted by Crowder
Fuel pressure steady at 50 lbs. No vacuum leaks. Every piece of vacuum line has been replaced to major components. I've removed the smog pump and capped the lines. Could this be the reason?
This?
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