To all, Well I think I have isolated the slight engine miss that I thought was being caused by a small vacuum leak. My voltage regulator went out on my way home from work and fried the alternator. I replaced both of them and the engine miss was gone. Could the alternator been not charging the battery enough and in some way affect the spark in the cylinders or the voltage regulator affect the spark in some way? I had been driving with the slight miss for 2 weeks or so. Chad 1973 Imp 1966 Galaxie 500XL __________________________________________________ Do You Yahoo!? Yahoo! Sports - Coverage of the 2002 Olympic Games http://sports.yahoo.com