This seems to be a common problem but after reading the posts, I am still puzzled.
My problem is as follows:
cold star perfect, idle normal driving for first 20 minutes flawless. At about 20 minutes, sputtering begins ususally at lower speed deceleration or at idle until engine sputters out. Then no success on restart, cranks fine.

Check for spark on craning, it does exist.

5 hours later, start car and drive away flawlessly for another 20 - 25 minutes.
Played with 2 different mass sensors, same issue, cap seems fine as does rotor.

Somehow If I have spart on crank would it rule out crank angle sensor, coil and OPV?

The car has 170 K kms.

PS Before this happened on warm start up after being run to full operating temp, it would after hot soak start with a little miss and 3 seconds later clear up and idle smoothly. May not be realted but.....

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Walter Sawczak
1990 300 E
1993 Lincoln Mark VIII
1983 Jaguar XJ6