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1999 Ford F-150 engine is backfiring after tuneup

Tiny
DAMIANBEVERLY
  • MEMBER
  • 1999 FORD F-150
  • 4.6L
  • 6 CYL
  • RWD
  • AUTOMATIC
  • 200,000 MILES
I replaced my upper manifold gasket due to a vacuum leak. I also replaced plugs and wires. Cleaned the throttle body. Well after putting everything back together I cranked the motor. The vehicle runs great in park and neutral. As soon as it is put into drive the motor bogs itself down, idles extremely rough and backfires. I have know idea where to start on looking for the problem. What would cause this to happen after doing the work that was preformed?
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Sunday, September 6th, 2015 AT 7:48 PM

3 Replies

Tiny
RIVSHERIFF
  • MEMBER
  • 4 POSTS
Did you put spark plug wires in correct firing order?
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Sunday, September 6th, 2015 AT 8:08 PM
Tiny
RIVSHERIFF
  • MEMBER
  • 4 POSTS
Also everything torqued to correct specs, did you take off any connectors?Check all that you think you may have touched
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Sunday, September 6th, 2015 AT 8:10 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Recheck your work then scan for codes and check fuel pressure with a gauge auto parts rent it. Check for vacuum hoses off broken/etc.
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Monday, September 7th, 2015 AT 6:41 AM

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