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Will not run plugs fire iregular - Corsica Chevrolet Cars & Trucks

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Distributor coil packs maybe dirty or need to be replaced. make sure wired up in correct firing order. if not that it could be your computer has gone bad!

Posted on Oct 04, 2009

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Posted on Jan 02, 2017

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My '99 chevy truck with 5,7L 350 will start but wont stay running. put new fuel pump and relay switch in


First you must determine if the fuel is stopping or the spark is stopping..If the fuel is stopping this could be a computer problem.. If the spark is stopping then it could be the IGN Module in the distributer. or any nomber of sensors. Squirt a little fuel directly into the Throttle body on the intake manifold.. If the truck runs longer its probably loss of fuel.. Do this several times to make sure, be careful and only use a small amounty of fuel.. you do not want a fire.. RE: Spark: Take a plug wire and an old plug..put the wire on the plug.. hold the plug against a good ground .. have someone crank the engine .. does the plug stop firing? The engine dies.. and will not restart for a minuet or so.. during this "no start" time do the plug test. If the plug will not fire during this time take the module out and take it to Orillys Auto parts.. They can test it.. really expensive part. Don't replace until you know it is BAD..

May 14, 2014 | 1999 Chevrolet K1500

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Wil not run


Eddie, first post said no fire on plugs, second said fire on plugs- whichnis it? Ifnyou have anfailing ignition coil, a plug will firemin free space, but not under pressure of the combustion chamber. Try new coil......

Mar 29, 2014 | 1992 Pontiac Grand Prix

1 Answer

Truck is not firing on 3 cylinders yet it runs.. Runs really rough, back fires, under powered.. Plugs are Wet, Firing order is correct. New Spark plug cables. Don't know that is wrong! Please Help


Check for spark at the plug ( may have coil problem).
If spark is good then do a compression check. Pressure shouldn't be less than 75% of known good cylinders.

Apr 17, 2013 | 1995 Dodge Dakota

2 Answers

Replaced sparkplugs and sparkplug wires, now runs rough. I checked connections all tight. check firing orger, looks right. run good till I touched it. Help.


Check the firing order with the firing order diagram that I have uploaded, and if that does not solve the problem then remove the spark plugs and be certain that there is an even spark plug gap between all of the spark plugs, (see the emission label under the hood for the correct spark plug gap) and be certain that there is not any split-fire or multi-fire spark plugs installed in the engine, because those plugs will not work with an OBD-II system, and a random mis-fire is the least that they will cause if installed in an OBD-II controlled vehicle.


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Aug 18, 2010 | 2001 Ford Taurus

1 Answer

My check engine light came on and stayed on


if you have no power loss or anything that seems iregular just pull ur hot battery cable of for about 5 minutes to allow computer reset then try it again;

Feb 18, 2010 | 2008 Mazda Mazda3 Hatchback

1 Answer

No check engine light on runs rough while in gear


Plug Mis-firing (firing-but not adequately) no light and no fire.
Causes: Spark plug bad, spark plug wire leaking.
If you can pull the spark plugs - and you find that one of them is wet or very dirty - compared to the others....the you have the wire/plug source identified.

Oct 14, 2009 | 2002 Ford Taurus

1 Answer

1991 lincoln towncar died while driving,not getting fuel.


try resetting the fuel pump inertia switch located in the side of the trunk.

Feb 12, 2009 | 1991 Lincoln Town Car

1 Answer

Miss firing


could be a wire crossed, or it's out of time. since you used motorcraft plugs, did you set them properly to the correct gap? replacing plugs without gapping them can cause the sluggishness, out of time can cause the mis-fires and rough running.

Nov 27, 2008 | 1994 Ford F150 Styleside Supercab

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