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Thread killa
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Discussion Starter #1
My buddies olds, 455 mild build, turbo 350 trans stock convertor, 3:55 rear gear, motor lays down between shifts, any ideas as to what causes this?
 

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Weak valve springs or running out of fuel.
 

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Thread killa
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Discussion Starter #5
stock converter. You shift and it pulls back to the stock stall speed, probable 1500 at best.
That is what I thought, need to check the fuel system too, I told him to get ahold of ptc and see what they recommend. Thanks for all the input.
 

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needs more gear?
 

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No idea if this could but your buddy's problem but I just battled a year long problem of randomly losing 3000-4500 of RPM on each shift. If I replaced the plugs after every 2-3 runs, it would not happen.

After replacing almost everything in the ignition and electrical system, it turned out to be the intake gaskets were sucked slightly into the ports on 2 or 3 cylinders. It was causing a slight oil leak into the ports which was fouling the plugs. It was also causing a slight vacuum leak and also disturbing the flow of the air/fuel into the intake.
 
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