08 colorado hesitation
check your fuel pressure,if not right before you go buy new fuel pump,try new fuel filter
2- take the vacuum line to fuel pressure regulator .if it is wet with gas,the diaphragm is ruptured need new regulator
3- have exhaust shop check you cat convertor,also if you recently have head gasket problem,some of those anti freeze is burned by engine and ran through your cat convertor causes it partially plugged,
4- A bad throttle position sensor could be another cadidate
5- bad or old ignition coil could be also the reason,as it could not produce enough juice on higher R.P.M
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