What is hesitating - the engine or the transmission?
When starting the car and putting it in gear, if the transmission shifts immediately into first gear and then shifts smoothly from first to second gear, I doubt its a transmission problem. However, if that isn't the case, you will probably need a new or rebuilt transmission ($1500+).
Engine hesitation can be due to a lot of things related to the fuel system that won't necessarily show up on a code reader - for example, dirty throttle body, fouled IAC (idle air control) motor, fouled EGR valve, etc.
SOURCE: 98 pontiac bonneville hesitation and jerking
When was the last time spark plugs and wires where done? That could be a possible cause, also check the timing through the distrubotor cap.
Hope this helps
SOURCE: Car wont stay running, even with foot on the gas.
fuel pump is getting ready to shut down replace it.
SOURCE: my 93 grand am seddenly
knocking in an engine is never a good thing. I'd check three things: engine bearings, valve lifters and timing chain, all of which can make noise. First thing though, is to put a mechanical gauge in place of the sending unit and check actual engine oil pressure. this will give you a good idea what is going on. low readings can be bearings, normal readings can be the other two items. I could give you a definite idea by listening, but I really can't hear it from here.!(one of the frustrating drawbacks to doing this online) An experienced tech can listen and tell you pretty much what's going on.
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