idiling problem /jerking forward while in motion

1997 LINCOLN MARK VIII
130 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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JASETHEACE
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The last shop told me the problem is a bad cam. I grabbed an upper and lower cam from a 96 from the junk yard. When I opened the value cover I didn't see any difference or worn metal. I replaced both cams anyway but problem still exists and is getting worst. Stalls and jerk forward while in motion.
Any suggestions.?
If it was just a tune up I think the shop would have handled it.
Dec 16, 2014 at 2:16 PM
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HMAC300
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scan for codes and check fuel pressure with a gauge auto parts rent it. clean throttle plate on both sides with choke cleaner and iac hole. then check for a vacuum leak like hoses etc.
Dec 16, 2014 at 3:36 PM