99 with high speed miss ? - Mustang Evolution

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Old 01-08-2016, 05:42 PM   #1
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99 with high speed miss ?

Got a 99 GT convertible that picks up a miss between 1400 and 2500 RPM. I changed the plugs and all COPs no codes. Iam not sure if its a miss or something out of balance the car will start to shake. Does it in park being just revved up. I have checked the grounding pulse to the COPs and it checks good. Any ideas??
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Old 01-08-2016, 06:30 PM   #2
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Last year my engine was shaking around lower rpms and when stopped. Ended up being engine mounts. There wasn't any misfires tho, it just ran a little rough when idling and getting on the gas slightly.


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Old 01-08-2016, 07:17 PM   #3
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Might wanna try cleaning the air filter/Tb

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Old 01-08-2016, 08:17 PM   #4
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New air filter ,plugs COPs and fuel filter. Will check mounts.
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Old 01-09-2016, 07:22 PM   #5
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Whats the fuel pressure suppose to on this engine , idling and running around 2000 RPM. Thinking fuel pump ????
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Old 01-12-2016, 06:03 PM   #6
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Would low fuel pressure cause a misfire around 1800 when revved up. Checked pressure today and at idle it runs 21 PSI when motor speeds up goes to about 36 PSI. Normal or to low. Also if is was a low fuel misfire should it throw a code ??
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Old 01-13-2016, 01:08 PM   #7
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That's way low. It should be high 30s at idle and 40 or so while driving. It could be a clogged filter, it could be the pump or it could be a vac leak.
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Old 01-13-2016, 06:28 PM   #8
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New fuel filter installed last weekend, same issue. Can not find any vacuum leaks.
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Old 01-15-2016, 03:42 PM   #9
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Ok took to shop today they found no misfire and fuel pressure ok. To him seems to think its something out of balance . Putting on the lift to check mounts and flywheel. We checked balancer nothing there. Feel it in park when revved up....
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