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1978 Firebird 231 V6 New Carb new plug wires the Engine Idles rough

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  • Cars & Trucks Master
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Have you done a compression test ? Could be a valve.
Does a vac gauge show any drop in vac ?
And how are the spark plugs and the rest of the ignition system ?

Posted on Jul 16, 2013

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Posted on Jan 02, 2017

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SOURCE: rough idle

check you throttle position sensor first then fuel pressure regulator, then fuel pump. i have a 92 and had to recently do a massive overhaul. my rough idle was caused by a malfunctioning tps with a small exaust leak causing it to race and an intake manifold gasket. also check your idle speed adjustment settings.

Posted on Dec 03, 2008

  • 43 Answers

SOURCE: 1993 Ford Explorer idles rough when engine is warm

try changing distributor cap & coil

Posted on Jan 06, 2009

michigan man
  • 3533 Answers

SOURCE: engine idles rough, misses at 2500-3000 rpm's

i would first check the timing and if that does not fit i would take the cover back off and look at the belt for a bad or missing tooth

Posted on Feb 14, 2009

  • 169 Answers

SOURCE: 91 Jeep wrangler New everything idles rough, no Power then dies

you check for miss how is compression

Posted on Aug 29, 2009

  • 1 Answer

SOURCE: Rough idle after initial startup.

1995 Lincoln Towncar Idle rough now check engine light on?

Posted on Dec 03, 2009

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My 97 firebird 3800 series 2 v6 runs rough idles very high in park and has no power and wont stay running


Check all vacuum lines for leaks. Check spark plug wires for and spark plugs that may be worn and causing idle misfire.also check the fuel pressure regulator. any codes?

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Oct 22, 2014 | Cars & Trucks

1 Answer

Where can I get a vacuum hose diagram for my carb 2barrel 78 oldsmibile cutlass supreme


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Fig. 19: 1978 Calif. - 231 V6


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Fig. 22: 1978 Calif. and Alt - 305 V8


Hope helps, keep us updated and dotn forgetted to rate this answer.

Jun 28, 2011 | Oldsmobile Cutlass Supreme Cars & Trucks

1 Answer

1998 firebird 3.8 v6 92000 miles runs great until 3000 rpm then it runs rough and starts to miss


Same thing happened to my 94 firebird. Did your car run hot at any point? Mine overheated and ended up melting a couple of plug wires.
I replaced the wires (and plugs). That took care of the problem.

Jun 09, 2009 | 1998 Pontiac Firebird

2 Answers

Under heavy acceleration the car stumbles, runs rough


I am having the same problem with my mustang, have replaced tps, egr valve and sensor, clean maf, new plugs and wires, new fuel filter, cleaned throtle body and still having same problems....Please help!!!!!

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How do you fix the timing on an 99' firebird v6?


check all vacuum lines clean fuel injectors.if it has been a while replace plugs and wires.also change fuel filter and air filter.

May 14, 2009 | 1999 Pontiac Firebird

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