Question about 1998 Oldsmobile Regency

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Intermitently will not accelerate at stop lites and/or slow speed

I have replaced all plugs, wires and coils plus run 3 cans of injector cleaner in the gas. I took it to a mechanic who put it on a diagnostic machine, but it would not mess up for him. The car has 59,000 miles on it and is sharp as the day I bought it new. Help!

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Sounds like cat clogged,does this get worse the longer you drive it, Worse hot.engine.

Posted on Jun 17, 2009

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My '01 impala 3.4 v-6 flat spots when COLD, at around 20mph. the idle is ruff with random misfires. acceleration is overall poor. when HOT, most symptoms go away leaving only some slight acceleration...


depending on mileage, but possible tune-up could fix it. if already done then check ignition coil pack and ignition wires also spark plugs, check vacuum hoses for leaks or porous, last injectors clogged - use some techron fuel injector cleaner (wal-mart has them). Also get the throttle body and iac valve cleaned by throttle cleaner . Also this other possibilities are to be checked and confirmed.:---- Engine running rough or misfiring can be cause by the following:

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1 Answer

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If it works well at speed and acts up when slowing or stopped it doesn't sound like fuel filter or pump. You can try running injector cleaner through the engine to clean the carborator injectors or fuel injectors if you have those. Look at replacing the plugs and wires on the motor.

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