1999 grand marquis stalls ?
2 Answers
First thing to check for is wiring issues, especially ground pathways, it only takes one bad ground to cause problems. Next a live data scan, could be a PSS or ISC dropping out. Then fuel pump problems, inertia switch.
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beatupchevy answered 11 months ago
Take a close look for any obvious wiring problems , turn the wheel while standing see if it happens , Mice can invade even a daily driver