Hello list, After having my carb rebuilt by a carb shop that has always done well before, the mechanic there insists that there are no vacuum leaks he can find and that he suspects the rough running to be an electrical problem. The plugs, sparkplug wires, distributor, etc. were recently checked and wires and plugs replaced(by a different mechanic). Is there a way to check the lean burn computer to see if it is working properly? The car randomly and sporadically loses power and/or knocks terribly at 50 to 70 mph, then after a few seconds or after I back off the gas and step back on it, power returns to normal and knocking stops. I'm not talking about knocking on hard acceleration, which it normally doensn't do. Also, at low speed coasting, hitting the gas occasionally causes a popping out the intake of the carb. Sometimes is blows off the air intake hose attached to the horn of the air cleaner assembly. Seems like I need to go over the electrical system another time. Greatfully accepting comments. Thanks Bruce S __________________________________ Do you Yahoo!? Free Pop-Up Blocker - Get it now http://companion.yahoo.com/