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Originally Posted by DEI37
I don't think it's actually misfiring. That will USUALLY set a Check Engine light. Like I mentioned above, I'd definitely start with a fuel injection system cleaning. This isn't the stuff you pour in the tank, exclusively. THey'll do that, too, but there is probably carbon built up on the pistons, in the combustion chambers, and on the valves. That causes problems all over the place. It's funny that you mention this...I just saw this same issue a week ago!
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A 95 has OBDI not OBDII, so it'd have to be misfiring pretty bad to set a check engine light. Trust me, I have a beater Corsice that is a 95 with the 3.1 as well. Ironically, mine started to sputter when I step on it hard, or cruise at 60-ish, just about two weeks ago. On my day off Friday I'm going to do plugs and wires. I bet it solves my problem, as I know the fuel filter and the fuel pump are only months old. If I were him, I'd start with that too.
Could also be a clogged cat causing too much back pressure maybe?