[Coolbreeze]

When you did the swap, did you swap the dash harness also?? If you look behind the driver side strut tower where the engine harness and dash harness connect, how many plugs are there?? The 91 engine harness, should have one(redish) & the 90 haness ahould have 2(blk & gry).. If all this was changed then you have another prob...

Check the ground for the engine harness over by the starter relay. It should have a round plug on it and then a ring to ground it to the body....Also make sure the ground is on by the EEC...