My son is driving our 1997 D1 4.0 GEMS truck right now to school. The other day it started to sputter and stall at idle and hiccup at RPM on the way home. Thankfully he safely limped home.
I couldn't detect a vacuum leak. Removed and cleaned the ICV and MAF. Battery and alternator check OK.
Fires right up and usually idles at the appropriate range, but after a bit the idle drops to below 500. If you push down on the gas hard, it will dip, but recover, but if you're light with your foot it stalls.
If I hold the RPM at 1000 or 2000, it will briefly hold, but after a minute or so will sputter, surge and drop. If you let off gas it will drop to about 400RPM and stalls about 1/2 the time.
No CEL and no OBD II codes popping up.
I need some direction here.
I couldn't detect a vacuum leak. Removed and cleaned the ICV and MAF. Battery and alternator check OK.
Fires right up and usually idles at the appropriate range, but after a bit the idle drops to below 500. If you push down on the gas hard, it will dip, but recover, but if you're light with your foot it stalls.
If I hold the RPM at 1000 or 2000, it will briefly hold, but after a minute or so will sputter, surge and drop. If you let off gas it will drop to about 400RPM and stalls about 1/2 the time.
No CEL and no OBD II codes popping up.
I need some direction here.