I have a 02 cadillac runs perfectly out of no where i have no speed only does 3 or 4 mph
Sounds like you are in limp mode. A common cause is a throttle position sensor failed. The car computer can't determine where the throttle is so you get limp mode. Inspect & clean the throttle body and pay attention to the TPS plug/contacts for corrosion, try re-seating it.
Il tryin that thanks
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