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Car stillruns very rough changed all plugs and wires and timming is on new gas filter it back fires and doesnt pick up speed

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  • Cars & Trucks Master
  • 2,415 Answers

Check your exhaust system...

Once the muffler (even those Walker products) start coming apart inside... they can block the outflow...

No outflow = no intake (engine strangling).

Same possibility for the catalytic converter (if you have one)

Easy way... get it to the muffler shop ... get them to read
you hand-full of DTCs (trouble codes (some times free))...

or

Get that penetrating oil... soak up those header bolts
(really well)...

Open the system... if it runs you now know what has to be fixed BEFORE YOU CAN SAFELY OPERATE the VEHICLE.

Hope this helps

Posted on Dec 11, 2016

6 Suggested Answers

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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: Rough Ideal on 2004 Ford Explorer

Open hood and listen for vacuum leak sound. pcv hose is most likley cause.

Posted on Sep 04, 2008

  • 2 Answers

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

  • 1 Answer

SOURCE: 1999 SL1 running rough

Had a similar problem; started fine but lost power under acceleration and would stall. I changed the fuel sensor relay in the fuse box located on passenger side of interior fuse box. Ran fine after that.

Posted on Mar 07, 2009

  • 79 Answers

SOURCE: rough idle

Barring any mechanical issues you most likely have a failed injector.

Posted on Aug 14, 2009

  • 20 Answers

SOURCE: Just changed plugs and wires in my 1998 Chevy

Firing order on 3.1L engine is 1-2-3-4-5-6. The ignition system is a waste-spark system, which uses 3 coil packs (1-4) (2-5) (3-6). Make sure that the paired cylinders' plug wires go to the same coil pack.

Posted on Oct 12, 2009

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