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'95 Crown Vic intermittent rough idle

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Sep 13, 2017, 1:26 PM

Post #1 of 1 (398 views)
'95 Crown Vic intermittent rough idle Sign In

Hello. I need some ideas to solve an ongoing problem with my 95 Crown Vic. I hope I can explain it clearly.

I have changed quite a few parts including Idle air control, DPFE, EGR air solenoid and MAF sensor. The EGR itself was changed last October. I was getting a P0402 code but that went away when changing the DPFE. Plugs and wires were also recently changed. Also replaced coil packs this morning, but the problem persists. When the car is in park or neutral it idles perfectly. NO vibration of any kind. When I begin to drive, and this is the intermittent issue, it may run perfectly but when I stop for any reason in traffic, the engine begins to idle rough, almost to the point of stalling. When accelerating from the stop it has diminished power and pinging. But it may go away with no explanation and run perfectly for the next 1-3 days more or less.

If anyone has any ideas as to what I may try next, I would love to hear from you. This car has approx 375k miles, so it's been a great car.

Thanks in advance.


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