99 mustang misfiring during hard throttle - Mustang Evolution

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Old 02-27-2012, 10:24 PM   #1
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99 mustang misfiring during hard throttle

Question: my 99 4.6 is misfiring under hard acceleration could this be plugs, coils, coil packs? I have a broken o2 sensor wire.
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Old 02-27-2012, 11:24 PM   #2
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Coils, intake manifold crack plugs...
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Old 02-28-2012, 05:19 AM   #3
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Quote:
Originally Posted by DaBluedude
Coils, intake manifold crack plugs...
Just found out i have a small leak from manifold gasket, could that cause it also?

---------- Post added at 06:19 AM ---------- Previous post was at 06:19 AM ----------

Quote:
Originally Posted by 1quick4.6

Just found out i have a small leak from manifold gasket, could that cause it also?
coolant leak
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Old 02-28-2012, 08:47 AM   #4
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When mine was misfiring, I had it ran at Oreillys and it was cylinder 2. All I had to do is change tat spark plug and it cleared it up.
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Old 02-28-2012, 11:48 AM   #5
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Quote:
Originally Posted by 1quick4.6

Just found out i have a small leak from manifold gasket, could that cause it also?

---------- Post added at 06:19 AM ---------- Previous post was at 06:19 AM ----------

coolant leak
Its possible. I had the same issue with my 96. Just do a full tune up with the new manifold.
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Old 02-28-2012, 12:53 PM   #6
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Re: 99 mustang misfiring during hard throttle

Quote:
Originally Posted by 1quick4.6 View Post
Just found out i have a small leak from manifold gasket, could that cause it also?
Absolutely, any time you have unmetered air entering into the combustion chamber,
the engine could lean out and misfire. Not a good thing with hypercraptic pistons...
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