88 Turbo Coupe - fuel supply problem?
I have a stock 88 Turbo Coupe and it drives great around town. But if I try to get on it a bit, it'll flutter and lose power past about 3500rpm. Turbo spools great up to that point but once high boost is sustained for a second or two, that's when the fluttering starts. It's not nearly as bad when the engine is still cool and gets a little worse after it gets up to full temperature. I already replaced the fuel filter, put in new spark plugs (properly gapped), plug wires, dizzy cap and rotor (and proper timing), and a new timing belt. I've also tried running it with premium fuel. I'm thinking it's fuel pump/regulator/injector related. Any ideas?