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You will have to have your vehicle scanned to retrieve trouble codes. with the codes diagnostics of the problem can be more reliable. It could be something as simple as a vacuum line cracked or off. check links below for more info, press the helpful button. Problem 4 Engine Hesitates Stumbles Lacks Normal Power
Turn key on and off twice without starting engine. count flashes, their will be slight hesitation, make one digit after hesitation make second digit.(flashes 5 times hesitates flashes three times hesitates your code is 53) if it countiues to flash, its making second two digit code.
i would try cleaning mass air sensor, its mounted in air duct between air filter and throttle body, they sell the cleaner at auto parts stores, also as stated bofore make sure the intake pipe clamps are tight and it's not cracked, if that doen't fix it i would investigate a fuel pressure problem either a weak pump or problem with regulator
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.