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Re: Can't find misfire
The 305 TBI engines have a higher compression ratio then the 350 TBI engine. I have found the 305 trucks benefit from running 89 octane rather then the 87 octane regular, but 93 octane does not seem any better. With the testing I have done 89 octane is the best fuel for the 305 TBI trucks.
I would not put 93 octane in the 350.
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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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