Make sure you hooked up the EEC ground. It is on the dirver side and had a plug that has a wire that is grounded to the body. I had the same probelm when I re-wired my 86 with 89 harnesses. The plug was open(the other end was missing) and I couldn't remember what it was for. After troubleshooting I cut the plug off and ground the end to the body.
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Mike
Blown~AOD'ed~331~
T-top~ 86GT
Check out car on my page here ------ > ~~My 86GT T-top ~~
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