1988 GXL pre-purchase question
 

Monday morning, I'm purchasing an 88 GXL. I went and drove it yesterday, and it seems pretty sound. No leaks, clean engine. Needs a little TLC though, but seems like a perfect project car. Got the guy down from $1500.00 to $500.00. He bought the car for his 17 year old son almost a year ago, and within 3 days of purchase, the guys son lost his license, so he was pretty desperate to get rid of it. Anyway here's the question: When I took it out and drove it, it started up right away, with no smoke, and it idled like a dream. I took it out on the highway and let it warm up. I has good power untill about 4000 rpm's, after that it seems to fall flat, Kinda like the A/C is on or something. Just wondering if anyone else has had this happen. The engine does't knock or anything. Any help on this subject will be greatly appreciated.

Aux ports might not be opening up.