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Re: tbi on older model motor
The TBI system used on these trucks will not tolerate much of a cam change. If the cam change is enough to lower the vacuum, a custom chip (prom) is needed to make it run well.
If it lopes it will not run well on a stock chip / tune.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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