i have a 92 ex cab 4x2 3.9 v6,the body has 272000 on it,it has a 2002 long block in it that has around 40000 on it,i have owned and driven this truck since 1995,around a year ago it developed a intermittit problem,it seems to show up after being drivin for a few miles and has reached operating temp,then if it is shut off for say ten minutes,sometimes less,when it is restarted and driven it will buck and snort and not want to rev upvery much,over the last year i have replaced virturally every possible thing that could cause this,i even put a set of redone injectors in it yesterday,no change,parts that have been replaced include,computer(twice) coil(3 times),crank positin sensor,cam position sensor,throttle position sensor,map sensor,fuel pump(twice),fuel filter,coolant temp sensor,not the gauge one,but the computer one,a sensor in the intake that i was told is a cool air temp sensor,dist cap,rotor,wires,o2 sensor,fuel injectors,i put in a used set and it seened better,so i bought a pro cleaned set and it seems worse,i have ran several cans of sea foam thru the fuel,it seems to run better for a short while the it will go back to the same old heat sink slobbering it has been doing,it wasntmuch of a problem last fall and winter,but now that it full summer,it happens almost daily,if you keep driving it ,after five or ten miles it will clear up,it seems almost like its rtying to vapor lock,fuel pressure is right on,pressure regulator is working correctly,fuel volume is correct,it has been on a scope at least twice,no codes,or other big problems show up,im thinking the only thing left to replace is the wing nut on the air cleaner!!!
i have peeled back the insulation and checked the splices under the PDC,everything seemed normal,no corrision noted,i even replaced the ign switch in the steering column!!!,also replaced the tach in the insturment cluster
the map sensor and tps were used from a engine i have for parts,but the odds of both engines having the same problem are way huge!!
as i said,no codes,no check engine light,it is heat related im sure!!
HELP!!!!!!!!!!!
RHAD