Purchased 2007 Grand Cherokee Overland 5.7 HEMI 4X4 with 75,000 miles on 5-1-12
Began stalling when stopped or coming to a stop with foot off the accelerator. Engine would start up just by restarting the Jeeps. Months later sometimes you would have to turn the key to OFF before it would start, most of the time just restart. Only once, in early October, did the jeep stall when driving at less than 25 MPH. One day it stalled three times in one 8 hour period. On average it would stall once every 7 to 10 days.
No codes, stored or pending during this journey.
Replaced the cam sensor. Check hoses for vacuum leak, found none. Did not help.
Replaced the ASD relay. Did not help.
Changed from Premium to Mid Grade. Did not help.
Changed to Regular Grade. Did not help.
Checked air filter and cleaned throttle body with STP Cleaner.
Added Fuel system cleaner to fuel tank. Did not help.
Checked all of the electronic connectors, none loose or damaged.
Did not help.
Checked transmission fluid (Yes I can, I have the non-Mercedes transmission.) Fluid level was fine.
Replaced MAP sensor and position crank sensor. Did not help.
Replace EGR Valve (I guess during the manufacturing timeline Jeep changed the alternator supplier.) My Jeep was one that you either had to remove the starter or saw off the lower bolt holding the alternator. No way could you simply remove the bolts from the alternator bracket. I chose to “sawzall” the lower bolt. I cut my bolt so close to the engine block I figured my stupidly would cost me a grand to fix.
I was fortunate I had backed the bolt out so far before the sawzall episode I could grab a metal bur on the bolt with needle nose and back it out. EGR replacement did not help
Changed oil and filter for the first time since I purchased the Jeep. Used SAE 5w30. Did not help.
With 79,000 miles on the HEMI I replaced all sixteen Champion 570 with new Champion 570. Sprayed each of the 16 boots with electronic cleaner verified the plug gap and torqued the plugs. Sprayed vast amount of STP throttle body cleaner in the TB and STP fuel system cleaner in the gas tank.
Four weeks and 1,000 + miles and no stalls.