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Re: 89 tbi no spark all the sudden
No spark on TBI is usually module or wiring. You need to verify the module is getting proper voltage and that the wiggling the distributor wires does not cause an issue. If it were an original distributor I would say look at the pick up coil to module wiring also.
Plug wires with high resistance can cause module failure. Also aftermarket modules do not have the feedback protection in Delco modules, if the problem happens again ohm check the plug and coil wires and check for a broken / cracked spark plug.
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1987 2 ton 
1982 250/TH350 beater in progress
Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping
Plus a mess o' tractors
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