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if it was a clogged cat i doubt it would go over 40 at all or even reach 40, needing a gas cap won't make it lose power but a bad 02 can cause some issues with the fuel mixture and that can affect performance, do you check to make sure the transmission is starting off in 1st gear?
My car is not going over 40mph and when I drive it doesnt want to shift to 4 gear also last month when I took it for an oil change they said the transmision fluid was leaking minor problem but it has enough fluid in.and it does have a smell when I turn the vehicle on
I think that your gas filter is probably pluged. It is located at the rear of the car in front of the gas tank. You may need a speacial tool to release the one hose end while the other is ususlly just a wrench.
A pop and hesitation is likely a backfire. The hesitation around 40 and 50 would be in keeping with that theory. There are several reasons you might be getting backfires and hesitation. If your ECM is adjusting the engine to run too rich this could happen. Misfiring might be occuring. Timing could be out. But one of the most likely is a restricted exhaust, likely due to a plugged, damaged or worn out catalytic converter. In some cases the converter may be bad enough to be giving you some performance problems, but not yet quite bad enough to signal an error. A vacuum test can help confirm whether this is exhaust related.