89 to a 91

jldtoker

Registered User
can anyone tell me whats different in the 89 sc automatic engine to a 91 sc automatic plugs, wires , spark plugs, and exc.....
 
because i changed my 91 tb sc engine with a 89 and i cant find the problem of why the car is so doggy and i had everything hooked up right no vacume leaks and good fuel pressure. i know that its a 4 wire o2 sensor in the 91 and a 3 wire for the 89. so idk if that would make my car run bad or something like that.
 
the engine was complete the o2 sensor on the drivers side is still the 3 wire and its a 4 wire on the other side. i left the wireing and everything on the engine
 
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