Smell of exhaust, Known hole in the catalytic converter, very muddy, mucky road, hissing sound from air intake as engine stalls, 2004 Jeep Grand Cherokee Laredo. Air Filter is brand new. Has quarter tank of gas. Was running fine 3 hours ago. After running it through the horrible road (Johns Island SC still underwater) and parking it, it began acting up.
Here are the common cause of surges, stalls at stops, slow idle speed, erratic idle, it is in most cases the idle speed control air-bypass valve and/or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving
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