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Ok so my 2002 Lancer ES 5spd hesitates and stumbles under hard acceleration. it is going fine and if i floor it it goes brrrr put put brrrrrr and continues to accelerate and stumbless again, the higher the gear the more it stumbles if the rpm's are kind of low. its got a new air filter, tried higher octane,fuel additives (z-max, injector cleaner etc...)
It has 75k miles. and i dont know what to do. i can do basic maintenance but not good at trouble shooting. :nahrung034:
 

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it could be your spark plugs. or wires??? not sure and as far as injector cleaner get b 12 chemtool. 2 kinds one goes into your tank and the other sprays like wd 40. get both. take off the senor before the air box and spray it will cleanit to shine.
 

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Plugs and wires.

NGK plugs and a quality wire. Done /thread


DO NOT PUT ADDITIVES IN YOUR CAR.
 
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