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Please can anyone help with this issue. I purchased this 2009 outlook 6 weeks ago from a dealership. About a week or two ago the car started randomly bucking going down the road and threw a check engine light. It came back for a misfire on cylinder 4 and catalytic converter. Last week when driving home from work it suddenly started loosing power and bucking even worse sort of like when you get bad gas. It would barely make it up a hill, not pulling at all and the engine reved up high. Took it to the shop and had the coil packs, spark plugs, plenum and gaskets, catalytic converters and gaskets, exhaust gaskets and manifold gaskets replaced. Picked it up and within half a mile it is doing the same thing but there is no codes. Im lost on what could be wrong. Any ideas??? Note: I also had to put in 2 quarts of oil within a week with no leaks. Please help!!
 

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What it does sound like is that the cats are clogged. Hopefully they did replace them after replacing all the other items and that they are new and not defective.
How cold is it?
 

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Check fuel pressure and all 6 injectors. You can also have your mechanic pull all 6 spark plugs to inspect how they are firing. (to lean or rich, or fouled) while he's at it, have him take note to the compression of each cylinder as he pulls the plugs.
 

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Please can anyone help with this issue. I purchased this 2009 outlook 6 weeks ago from a dealership. About a week or two ago the car started randomly bucking going down the road and threw a check engine light. It came back for a misfire on cylinder 4 and catalytic converter. Last week when driving home from work it suddenly started loosing power and bucking even worse sort of like when you get bad gas. It would barely make it up a hill, not pulling at all and the engine reved up high. Took it to the shop and had the coil packs, spark plugs, plenum and gaskets, catalytic converters and gaskets, exhaust gaskets and manifold gaskets replaced. Picked it up and within half a mile it is doing the same thing but there is no codes. Im lost on what could be wrong. Any ideas??? Note: I also had to put in 2 quarts of oil within a week with no leaks. Please help!!
Drain out the CPU and start from relearning mode. Both posts on the battery need to be disconnected, hook up the ground to positive on the battery posts ONLY not with battery connected or on battery, let it sit for a few hours to drain all codes and sensors as well as resetting the CPU to relearn mode. remove cable from cables and then reconnect the battery. there is a restart you must follow and get things back in order. Best solution before ever taking it to a mechanic. A big ripoff and parts not needed. heres a link to help guild you. and yes it works on Saturns.

 
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