SOURCE: Sierra 3500HD rough idle
do a good tune up it is not the tranny . you might think about a good diagnostic test to make sure it is not a senser it is hard to say for me onless i could look the truck over my self . good luck
SOURCE: 94 Camaro V6 transmission in reverse on all shifter settings
check to see if your shift cable is stretched or broken, also look on the transmission itself to make sure that the lever where the cable attaches to is not bent. also you can check under the shifter itself and make sure the linkage there is all ok. it sounds like your shifter cable is the cause for your problem.
if the cable is ok and you can see the shift lever move on the transmission than the next likely cause would be the valve body in the transmission.
SOURCE: I have a GMC and I have replaced all the sensors
You may have a restriction in the exhaust, like a clogged catalytic. Converter. The mass air flow and the fuel pressure were good ideas too. lee
SOURCE: I have a 1990 GMC Z71 4X4 with a 350 TBI 217K my
yes use a cable comalong. as for you motor can you hear the vavles rattling with that many miles ur heads may be getting bad if the vavles don't open enough i could see it not running right
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