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Can't find the problem

O

OneGun88

New member
I have been having troubles finding the problem with my 1999 Pontiac Grand Prix 3800 Series. It runs OK whenever I barely hit the gas but when I give it more it wants to dog down. It also will have a very rough idle and dies all the time. I dies when I'm at idle and when I'm driving down the road. I have been getting terrible gas mileage since this started. I have changed spark plugs and wires. I've changed an oxygen sensor that was bad and still nothing has changed. Could someone please tell what could be wrong with it.
 
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does it seem to bog down when you get into the throttle heavily? have you checked to see if the cat is clogged?
 
Yeah it bogs down when I give it a lot of gas and also does it sometimes when I give it less. I haven't checked the cat.
 
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