90mustangGT said:Get a vacuum gauge. Measure it at idle, then rev to 2500, if you you get less vacuum at 2500, then that is a sign of clogged exaust. I have a backpressure gauge setup, but it isn't nessasary.
90mustangGT said:It very well could be carbon buildup in the combusition chamber. Cleaning of the injectors might be a good idea. What is the fuel pressure under load?