[MT-2500]

Originally Posted by 1996LTOwner

I really can't give you a definate answer. There are soooo many things that seem to affect this engine. The miss seems to show up more during the warm up time. Once the O2 sensors are warmed up and the computer can adjust the timing for normal operation it seems like the miss goes away. I chased the problem for a few years until a one year old distributor cap shorted out, left my family and I stuck on I95 and I thought the timing chain had jumped because the engine would compression lock during start attempts. After replacing the timing chain, then the cap the missing and hesitations went away. It seems to be a guessing game with this engine. I really don't think your problem is with the fuel pump. My truck had 192,000 on it when I traded it in. No matter how much I did for it, something else would break. I just got tired of feeling like the truck was a full time job. I racked my brain over the miss. Some times it did it when it rained, sometimes when it was cold out, sometimes when it was humid. After a few years I got tired of trying to track it. If you decide to keep it, good luck. I don't know about the 98, but to change the timing chain on the '96 the engine has to be pulled or you'll never get the timing chain cover / oil pan seal to seat properly. One other person replaced the distributor due to some kind of bushing wearing out. Another was able to break some kind of tab and turn the distributor slightly like the older cars use to have done to adjust the timing.

LOL
'96LT

Turning the dist has no affect or chang on engine timing.
The engine timing is set off of the crankshaft sensor.
MT