About once a week my car will sputter & die when I let off the gas & sometimes while still pressing gas & sometimes the idle fluctuates. We replace idle position sensor & still acts up
Clean your MAP sensor with maf cleaner. Possibly replace the IAC (idle air controll) valve. Any scan codes?
Don't know where those r located and no scan codes
Google them. the MAF sensor is on the Air cleaner top, you may need a tamper-proof driver to undo the screws. MAF cleaner is at any auto parts store, it's amazing what that can do sometimes, I had a similar prob. once. The IAC is on the intake manifold somewhere, you may find it on google or utube.
Thank you will give it a try
Looking for a Used Grand Marquis in your area?
CarGurus has 1,813 nationwide Grand Marquis listings starting at $2,250.
Search Mercury Grand Marquis Questions
Mercury Grand Marquis Experts
Related Models For Sale
Used Cars For Sale