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Old 09-03-2002, 07:43 AM
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Hi! I'm a new member to this board and enjoy reading the topics and posts very much. I have a '93 GMC Sierra SLE regular cab short bed pickup with a 5.7L and R700-4 auto. I have installed a Hypertech Thermomaster chip, 160 degree thermostat, Hypertech power pulleys, Hypertech free flow air filter, Accel super coil, 1" tbi spacer, and removed the air cleaner silencer and replaced it with a straight flex tube to the inner fender well. Also the truck has a 3.73 posi rearend. After installing these items, I had a noticable increase in power. The only problem is that from a dead stop, in low gear, when I floor the pedal, the truck falls on its face like it isn't either getting any fuel or totally flooding out. Then after this initial hesitation, it kicks in great and leaves hard. The truck has over 100k miles on it. Could it be my timing chain has slack and is throwing my timing off a bit? Also, would the tbi vortec intake that GM Perf. Parts sells and a set of Vortec heads really help my performance? If so, would I need a different chip?

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Old 09-03-2002, 08:13 AM
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I would try dialing in your throttle position sensor first, sometimes they can be out significantly which throws off the mixture. I don't have a link just for Chevy's describing the procedure but it is a common problem on all cars. Basically you slot the mounting screw holes and use an ohmmeter to get the correct reading for idle speed. I have never done it on a Chevy but all the Fords I have done sure fixed a lot of problems I had assumed were vacuum leak related or computer caused.

Have you tried your factory chip? Most of those aftermarket chips don't work too well in my experience except on the dyno. Of course this is all assuming there is nothing wrong mechanically with the car like leaks, dirty idle air bypass port, throttle plate carbon buildup, ignition failure locking the timing, codes on the computer, dirty air filter, clogged fuel filter, dirty spark plugs, stuck open EGR etc. etc. etc. Make sure you check all those things before you condemn anything expensive.
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