OBS idling problem?
OK, so ill try and make this short. i bought a 97 with a bad engine and installed a 40k mile engine. after about 3 days of driving it around i noticed after jumping off the freeway and coming to a stop light, the truck would start to shake then the shake would increase until the light turned green, as soon as i take off the truck runs smooth, no bucking/hesitation and no loss of power, this would intermittently happen at everyother stop light. now also when starting the truck after its allready at operating tempature it kinda diesels in other words it idles up and down about 5 times until the idle sits normal. i have tried everything, using all of the old sensors from the old motor, ICP CPS HPOP IPR etc.... no codes or code light ever comes on. i have 8 new injectors with new cups and orings, two brand new fuel pumps and new mech fuel pump, new UVCH. ran a compression test and leak down test thinking i had a valve that wasn't sitting correctly, all checks out good. cranking fuel pressure is at 20 psi and sits at about 60 at idle even when the truck is shaking, now correct me if im wrong but i was told that low fuel pressure at idle can cause an uncomfortable idle? i had a friend from ford look at the truck and hook up a scanner when the truck was shaking, injector rate was normal and all sensors were showing correct voltages. i am completly at a loss and any help from you guys would be great, just tell me what to try and im on it, thanks.