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Hi Im David and lets start with while the vehicle is running. these engines are known for a lot of problems. lets try checking for vacuum leaks. while the engine is running, take a can of throttle body cleaner, spray it around the base of the upper intake, anywhere there is a vacuum line/hose, vacuum line at brake booster, vacuum line going to each fuel injector and so on. if, while spraying, the car stumbles or revs, then you have found the leak
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