RepairPal is your advocate for car care advice and guidance

Q: Vacumm on 1994 Dodge Ram 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
have a 94 ddoge ram, when I go to start it. It sounds like a vacumm leak runs rough, fouls out plugs. I can't figure out where it is coming from. I did change the map sensor in it. But had no luck. Any help would be greatly appreciated.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
Carefully inspect all of your vacuum hoses and PCV valve. Pinch off the vacuum hose to the power brake booster to see if the engine smooths out. If the engine smooths out, the Power Brake booster is the source of the leak, If no, then Check around the intake manifold gasket by spraying throttle body cleaner around the manifold with the engine idling. USE EXTREME CAUTION when doing this as the throttle body spray cleaner is highly flammable. Try to avoid spraying near the throttle boby as vapors drawn into the the engine through the throttle body will produce false results.If you had a noticeable change in engine speed, the manifold gasket has probably failed. Another possibility is the plenum pan gasket at the bottom of the manifold which requires removal of the intake to inspect and replace.
your idle air sensor behind the throttle body is dirty or just failed in the open position.they cost less then a $100
Didn't find what you were looking for?