Ken, Thank you for your response. Amazing how much there is to learn. Ps. Did you ever get your truck fixed? What was the problem? FWIW: I heard of a case where a gas station attendent was (mistakingly) putting disel fuel in vehicles and they were stalling, not getting enough power..after about 100 cars/complaints the problem was traced back to this "incorrect" fuel. (attendent was fired, needless to say.