Weird Electrical Gremlins!!

[MTU 50]

When I bought my car 2 years ago the original owner told me that the check engine light comes on from time to time. He brought it to the dealer twice and they hooked it to a code scanner, but did not get any codes back. He said it didn't seem to affect the cars performance so he lived with it.

Up until this april, the check engine light did the same thing for me. It would usually come on when I accelerated past 1/4 throttle and turn off when I took my foot off the gas. Again the car seemed to drive fine and I didn't notice anything unusual.

Now comes the weird part. I took my car out of its 5-month storage in late march and the check engine light does not come on at all. Instead the parking brake light comes on when I accelerate and goes off when I get out of the gas. The parking brake is all the way down and I assume it is disengaged. I am not getting bad fuel mileage or anything.

WTF? First the check engine light pops on with no codes showing up, and now it switches to the parking brake light. Any idea whats going on?

Thanks

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1991 GT, AOD, Moroso Cold Air, 3.73s, Pulleys, 3-chamber(the left one fell off-NO time+No Money=College), FMS c-springs, and KYBs