The new guy with a problem, Go Figure.

[My05CRD]

I hate to start off with questions, but I am at a loss on this one. I have owned this Jeep for a long time and have crossed many items off the check list. The Jeep has over 200,000 miles on it but a lot of things have been done. Timing belt, water pump, radiator and fan and so on. Long story short. Last week my wife and I were on a trip and the engine developed an intermittent loud tap from the engine and a misfire. I of course thought fuel injectors and replaced all four with rebuilt units from AutoZone. 1240.00 dollars worth. I just knew that would solve the problem but not so much. The darn thing still does the same thing. Runs fine for miles and then taps bad misfires cylinder for few seconds or less later runs fine again. The tap sounds just like an injector hanging open. That loud and horrible sound. I am at a loss. My mechanic son says it may be a bad rocker but I am not sure. Any advice would really be helpful. Thanks from the new guy.

 

[My05CRD]

I know the rockers are made of Glass on these engines but has anyone ever had an Intermittent tap come and go with them? Maybe a roller tip problem????