93 350 shakeing at idle

[atharp]

i got a 93 350 auto, it has a bad shake at idle. i put a seal kit thiking it was a air leak but it still shakes. ive noticed its guttless and gets poor milage and its hard to start sometimes. the engine has been replaced a while ago about 40k or so. ive tried run the 15ppm and the 500ppm diesle with additves and run trany fluid in it but the shake comes and goes thats what thorwing me off. does anyone have a idea why it dose this?

[FordGuy100]

My guess is a bad injector or two. With the engine idling, take a wrench and loosen the injector line that goes onto each injector. Do it one at a time. If you loosen it and it makes the truck run worse, that injector is good. If you loosen the injector line and the truck doesnt run any worse, thats the injector. Thats what I would do first.

[atharp]

i tried that and they all have a drastic pich change

[FordGuy100]

Well then next step would be to pull the valve covers and take a look in there to see if anything is amiss. After that, get a compression tester, pull each glow plug, and test. IDI's should be around 450psi, and they all should be within 10% of each other.

[atharp]

i pulled the injectors put and had them popped tested. 1 of 8 was good 3 had poor atamization 1 was stuck open and 3 were popping at 1150psi and had a poor mist and one was perfect but it was new. i know the compression it good i never heard a old 7.3 cherp the belt when it turned off

[ABatick]

where do you go to get them tested.

[atharp]

at a credited diesel shop. they do very good work. i see them alot when they come in to my work.