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1999 chevy Silverado 1500 manual LS

A few days ago. I was driving home... going about 70mph. I then noticed I couldn't go any faster! I accelerated to see if I could get to 75mph but when I hit the gas the engine would just rumble/sputter and lose power. When I let go off the gas and went back down in the 60s and 50smph, I still sputtered and continued to slow down. So I pulled over and shut the truck off. Waited a few minutes started the truck back up, and it started fine and ran good. I drove off the freeway and made it home just fine but I was on side streets. Evreytime i do this it always loses power. I changed the fuel pump. fuel filter, spark plugs, and ignition wires in the right firing order. Help what could be the problem!!!!!

Posted by Kari on


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Ignition coil could be a fault. Air filter could be plugged up, cats could be plugged up and when the exhaust gets hot it basically swells shut. Could be a bad mass air flow or a bad map sensor, but its rare for these to fail and not set a code of some sort, though I have seen it a few times.

Posted on Jul 16, 2015



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The coil could be breaking down under normal operating temps, or the pick inside the distributor. Either that or you may have oxygen sensors that are going bad, do you have a check engine light come on when it acts up?

Posted on Dec 28, 2013

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  • Kari
    Kari Dec 28, 2013

    yea check engine always pops up when it happens. what coil? distributor cap right?

    CHICO Dec 28, 2013

    ok have it scanned for history codes, there is a coil that connect to the distributor cap, will be on the passenger side of engine next to throttle body. willhave a plug with 2 wires and 1 pencil sized wire that goes to distributor, have it checked for proper ohms.

  • Kari
    Kari Dec 28, 2013

    cool ill check that out earlier today



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Your timming belt has jumped a tooth.Remove the covers and check that all teeth are ok.Then tighten or change the timming belt.I would fit a new timming belt.Has it is costly when they fail.Good luck.pippall.

Posted on Aug 09, 2009


Justin Case

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SOURCE: 1991 Jeep Fuel Control Issue

Hey Mudkicker,

Who ever thought of putting an electric fuel pump inside a tank of gas........

Check your other gauges for accuracy. They do that when a ground is loose.

Check the wiring from the fuel tank along the longitudinal frame for frays and shorts. Plugs are secured.

Under the hood, passenger side, check the fuel pump relay. Switch it with one of the others to test it.

Bring the vehicle to an auto parts store. Ask them to break out he code reader. Check for diag codes

Comment me back

Posted on Aug 26, 2009

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