Question about 1994 Chevrolet C1500

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93 chev silverodo missing on 2 cylinders

My truck is hard starting to get it started I basicly have to hold the gas pedal all the way to the floor. When it starts it runs really rough and is ready to stall. It seems to have two dead cylinders. When I hold the gas pedal  down about half way the truck smoothens out like its running on all cylinders and seems quiet like it used too at high rev and at low rev it just sounds rough and stalls out at idol and I have alot of carbon coming out from the exhaust. I checked the distributer and rotor and it checks fine, I put in new spark plugs in the old ones seemed carboned up and thats not the problem. I put in a new ignition control modual. I checked the coil out with a mutimeter and it checked out fine. Im getting fuel to the carb i see it splatter up. Any suggestions to what this may be. Im out of ideas. Im putting in new spark plug harness but other than that Im out of ideas. Any input would be appreciated thanx.

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  • shanonmcnab5 Jan 14, 2009

    I did a compression test today my number 5 and 6 cylinders are at 90% and my number 3 cylinder is at 95% all the rest of the cylinders are running at 110%. So Im thinking it could be a sensor maybe a map sensor, ECM sensor, or O2 sensor is there a special way of testing these sensors myself. Is that a possiablity any suggestions would be appreciated. It seems too crank over really well.
    Thanx.

  • shanonmcnab5 Jan 19, 2009

    It was intially the ignition control mod and when I had replaced the spark plug wires. I double checked the routeing and discovered 2 of the wires where crossed.Your post is what made me go back to double check the spark plug wires. Thanx so much for your help.


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This could be a few things. The first thing i would check is the firing order as 2 crossed leads will cause this . If this checks out ok try a compression test. A blown head gasket between 2 cylinders will also cause this. Hope ive helped

Posted on Jan 13, 2009

  • mickysaad8 Jan 13, 2009

    Been thinking more about your prob and realised that if you have a lot of black smoke coming out of exhaust , i would think that the float level in the carby is too hi or the needle and seat not sealing causing the motor to flood hence needing to hold gas pedal to the floor to get it started. Now that i think about it , im quite confident this is the problem.

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