Stalling when warm

Asked by Sep 10, 2019 at 07:51 PM about the 1980 Ford LTD

Question type: Maintenance & Repair

aquired a 1980 Grand Marquis with 113,000 miles.
The engine is the 351. The car suddenly stalls
while driving, after 15-20 minutes. It will idle all
day. After stalling, it will start immediately back up
and stall within 30 seconds. I can repeat this
procedure and each time it stalls 5 seconds
sooner. If left to cool, it will stall depending upon
how long it cooled off. I suspect cats are old. The
previous muffler was rotten but the shop said the
cats looked usable. Before changing the muffler,
the car stalled but after a longer driving period. I
have changed the fuel pump as well. Leaving the
gas cap on or off for vacuum has no effect. I also
only slightly suspect hat the new fuel pump is bad.
Coil? Ignition? Oh, I bought the special fluid and
rented the tester for a cracked block as well and all
is well. I hate to spend $700 on cats for no reason.
When idling, there is exhaust coming from the tail
pipe. Oh yea, changed the o2 sensor as well. One
cat each side feeds a single exhaust. Hellllp?

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