Re: Won't go above 45 MPH
I had this happen on an '86 Trans Am - it was a blocked cat converter. It's easy to test, just drop the pipe - and go for a noisy test ride 
BTW: eventually, it will get worse to the point that it won't run at all - especially after it gets hot. The cat will completely block off the exhaust until it cools down.
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Marlin
70 Yenko Nova-350/360, 4speed M21, 4.10 Posi (Daddy's Ride)
69 SS Nova-396/375hp, 4speed M20, 3.55 Posi (Benjamin's Ride)
67 RS Camaro-327/250hp, 2speed Glide, & 3.08 Open (Danny's Ride)
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