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Hi! Welcome to JustAnswer. Thanks for coming! I'm Ron and I'll be working with you on your question today.
Do you happen to have access to any testing equipment like a vacuum pump and scan-tool that can read data in real time?
Ok. To solve this problem will require the use of some testing tools. If you'd like I can give you a little background and I can provide the testing procedure... but unfortunately, there is no 1-answer "it's this..." type of answer here. Would this be ok with you?
My apologies. If you'd like to continue on with this at another time, the thread will remain open. Have a great weekend.