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Missfire at Idle.

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Old 05-01-2009, 01:00 PM
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Riceinator
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Default Missfire at Idle.
Hi guys,
I have been trying to hunt down a pesky misfire at idle. I am not sure which direction to go in first. I have replaced PCV valve ,screen and rubber grommet, distributor, ignition coil, ignition module, wires, plugs. Pretty much the entire ignition system is new. It drives and pulls hard, but has a misfire at idle. What should I do?
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Old 05-01-2009, 01:10 PM
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ryan_89_mustang
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Have you cleaned up your 10 pin connectors before?
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Old 05-01-2009, 01:37 PM
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Riceinator
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Which 10 pin connectors?
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Old 05-01-2009, 01:41 PM
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ryan_89_mustang
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The ones that look like salt and pepper shakers on the back of the intake. I am going to do mine soon to see if solves some of my intermittent problems. http://www.fordfuelinjection.com/?p=85
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Old 05-01-2009, 09:56 PM
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ttt....
anybody else have any ideas?
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Old 05-01-2009, 10:35 PM
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lx5.0
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have you tried to clean your maf
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Old 05-01-2009, 11:08 PM
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08 Bullitt 2310
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I had an intake gasket leak do something very similar.It was the base to plenum gasket.
Possible vacuum leak
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Old 05-02-2009, 03:41 PM
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ryan_89_mustang
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Originally Posted by lx5.0
have you tried to clean your maf
.....He has a 87
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Old 05-02-2009, 04:09 PM
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You didn't say rotor, but I assume you replaced yours ?
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Old 05-02-2009, 11:11 PM
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Riceinator
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Originally Posted by 08 Bullitt 2310
I had an intake gasket leak do something very similar.It was the base to plenum gasket.
Possible vacuum leak
How would I be able to pinpoint a vac leak or an intake gasket leak? Carb clean trick?

And yes, rotor is new.
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