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I'm mesmerized by the discussion here. I don't know what any of it means and I'm not getting any codes requiring trouble shooting. Thankfully, Ronnie's input and insight into all things Reatta is a godsend.

Yeah I agree with Ronnie. I've been driving mine without the CPS magnet for about a year now and no issues other than less than ideal gas mileage. Although I've never had the cps working so not sure how much better that makes it run. I get a stumble sometimes from a stop, but she drives nice and smooth at speed unlike the problem you describe. I would eliminate the simple stuff first. Could be as simple as you need new plugs and/or wires. If that's not it the next thing I would check is your fuel pump/pressure and maybe your coils. Maybe clean out the throttle body real good as well and make sure the MAF sensor is clean. Also could be related to a vacuum leak, which could be anything from a loose vacuum line to a bad gasket somewhere.

OK, I'm looking at a '91 Riviera/Reatta factory service manual which might be slightly different than previous years. 2seater got me thinking when he said that the trunk lock mechanism is not mechanical...DUH I should have remembered this (give me a break, I'll be 72 in a couple of months). I checked opening my Reatta trunk with a key. When turned, It activates the trunk release solenoid located on the inside edge of the trunk lid. So, reading from the '91 FSM you might want to check at the fuse block; fuse #2 (body) 20 amp, and circuit breaker #23 (seat/door lock) 30 amp....they appear to be related to the trunk release wiring although the FSM is a little difficult to interpret.

I have to use the key to open the trunk. The '88 models didn't get keyless remotes.