Question about 1989 Chevrolet S-10 Blazer

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Part time miss

Once in awhile the tack starts jumping and the truck missing, then the tack goes dead and the truck runs great. It's getting worse so i need to find the problem

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  • Anonymous Mar 23, 2014

    misses but then smooths out



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  • 188 Answers

Sound like you coil is going out. Need to replace the coil and go ahead and do a complete tuneup, plugs, plug wires, distributer cap & rotor button. It will run like new, plus a can of SEAFOAM for the gas tank to clean to fuel system.

Posted on Feb 13, 2009


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I just replaced the intake and right head gasket on a 98 expedition 4x4 5.4l and now the vehicle has a miss when driving with light acceleration betweeen 35-55mph. this is a dead miss but you can't...

I also have this exact truck and I am a drivability technician.
First if you have a dead miss check for waht code is stored. Even if the light is off a code should still be stored. Once you know what cylinder is missing you can rotate the coil and and see if the miss follows by checking codes again. Do the same for the injector even tho this is alot more work. Once you determine that the code always stays on the same cylinder then you can inspect for maybe an intake vacuum leak or if the EGR is close by sometimes a EGR stuck open will miss at low RPMS. Its suppose to be open when cruising so a miss would not occur then.

Why was the engine work done. maybe you didnt fix the pryor problem if you didnt have the head sent out to be inspected and block tested. These engiinee heads are known to fail with cracks thats why it needed to be tested. Hopefully you did this

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first how many miles are on this blazer and have you checked all the vacuum lines on the engine ? also has it been tuned recently like plugs wires etc? It might just be time .. Also change that fuel filter it might be getting dirty also.. just a few ideas holler if you need more Jerry

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