Question about 1996 Chevrolet K1500

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Truck jerks when at nutral throttle, and looses lockup after 10 m

I have a 1996 silverado, 5.7L 4L60e. When I got this truck I looked at the distributer and though it was one of the new ones without a roter.(doppy me) I finnaly replaced the cap and roter and then started feeling a jerkieness when going down the highway at nutral throttle. I have to let off the gas till I slow down then accelerate slowly as far as I dare above the speed limit then slow down again. That keeps it from jerking. While all this was starting, my tranny was going out. I replaced it with a used one hoping the jerks were trans. related. There still there, and I don't have converter lockup untill the hole mess warms up. then about 8 to 10 miles down the road, lockup stops working. I still get the jerks in O/D. This may be two problems, but I would really appreciate any help anyone has. Thanks,
Dave

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  • Joel Lasater
    Joel Lasater Jan 25, 2009

    I did find a vacuum leak and pluged it and it seemed to help alittle. I'll change the fuel filter cause thats the cheepist fix. I've also suspected I might have a leeky injector, but I've been hopeing I didn't have to go that deep in the engine. I have also noticed a little pinging when boging the moter. From what you said I'll look into the possible causes of a lean fuel condition. 
    Thanks MrScary,
    Dave


    Any ideas on the lockup problem?

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If you engine isn't running right the trans won't act right. You need to check all of you spark plugs, they need to be gapped @ .060, you could also check them to make sure that they are not cracked. They are easy to crack during instulation. You can put also put electrical contact grease inside the plug boots. This will aid wire & plug connection. The fuel pressure should be 60-65 psi (non running with no leak down, you may need to cycle the key on & off 2 or 3 times to acheve peek psi) The common problem with these is that the injector line busts inside the intake.

Posted on Feb 10, 2009

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It sounds like to me That the Timing may be a little off. I would get that checked and check the Fuel pump and Filter. If the Fuel filter is a Little clogged it could cause this Prob.

Posted on Jan 24, 2009

  • Travis Humphries
    Travis Humphries Jan 25, 2009

    You might Just Check the Torque Coverter, Hopefully you won't need a New one! No Problem On the Help! Happy to Help Ya!

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