i have a 91 s10 with 4.3 v6 .my problem is i just changed the idle positon sensor as it was idling up and
down . Did the reset of the sensor at 40 mph . come home and parked it . got up the next morning for work , started fine then died . My idling problem is fixed but now it seems to be dieing on me after
i start it up or when i put it it drive or reverse. It also doesn't leave a code afterwards. cold this be the map sensor or the icm ???? Any ideas would be greatly app. thanks in advance

 

hello chevymandan, im a DYIer with a 99 4.3v6 sounds like a lack of fule pressure maybe, try to buy or
rent apressure gauge from parts store, there easy to use and sould help to yes/no fule issue. connect gauge to fule line-turn key to on- you dont even haveto start your truck-it should read 62psi or better.
if not it could be bad fule pump. like i said maybe.

 

Does it shutter before it dies? When you put it in gear does it occur immediately?

 

does it stall when you give it gas or before then?

 

It could be the EGR valve. Mine was idling ruff now it has started dying when i have it in gear and am not moving.