My 1999 SVT has started to run like a set of 4 barrel secodaries werent opening, it will continue to rev but not make any power. In the last month I had the engine checked and the EGR valve changed. In the last week the car has stumbled at high speeds, like I had bad fuel, an electronics problem or maybe a plugged catalytic conveter. Today it did it a low speed and it was like the car bucked three or four times. Right before it happened I noticed the speedometer needle was jumpimg around, at a stop. Thanks in advance for any help.
