What is your question?
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What is your question?
replaced MAP, spark plug/wires and gaped plugs now engine has no vacuum at idle and sound like it is missing though firing order has been check and rechecked but vacuum works while driving about 40 mph, what should I check and how should I go about checking it.
1 Reply
Vacuum is a result of air being sucked into the engine while it is running; therefore, if the engine is running it must have vacuum. You may contact me directly if you would like help closely diagnosing the problem. Thank you. david@apexautoaz.com