Is it showing a check engine light? Try and get it scanned instead of guessing what it might be, it will save you alot of time in the long run. The opti is one of the weak points of the LT1's but they are good engines. Let me know if you have any conversion questions and I will try and help.
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Chris
1968 Camaro SS
LS3/T56
Full of DSE and Holley parts
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