Dj

95' buick riviera 3.8L w/supercharger. Car runs extremely rough when cold started and won't stay running under a load,but after 15 min. she's OK. Had everything done to it, plugs,cap,rotor,wires,air filters, pcv valves, etc... Is this a common problem for this vehicle's year? I'm running out of money

Scan it and look at coolant temp sensor inputs, fuel trims, ambient sensor inputs, no quick answer for this.

Check the gasket between the super charger and the lower intake.....have seen the gaskets crack, and create a vac leak.....as the engine warms, and things expand, it could possibly seal.....

Best way to check this, is start the car cold, let it stabilize a few seconds, then spray carb cleaner all around the joint between the SC and the lower intake....if the idle changes, that is your problem....

Thanks Max, I'll give it a try and I'll let you know. My friend is at work today,but will check it out hopefully tomorrow....

Thanks to you also techII. I will let you know the outcome as soon as the vehicle becomes available..