my car wont go faster than 20mph what is the problem?
More likely, your clutch starts to slip up ! Transmission is the best bet based on how u explained it ! I don't think sensor is the problem !
I'm not sure about this but have you checked the valet switch? It could be on
Sometimes a clogged catalytic converter will strangle the engine- have it checked first-
did you check your maf censor it is possible to limit your engines output
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