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No codes, but idling engine miss 4.0

  • Thread starter Thread starter don ruggles
  • Start date Start date Dec 17, 2021
don ruggles

don ruggles

15 Year Member
Jan 11, 2013
61
4
8
Dec 17, 2021
#1
  • Dec 17, 2021
  • #1
Guys, I'm thinking vacuum leak causing this or egr, but why no codes? Has original coil pack on it. 05 ,4.0 mustang. Any help is appreciated.
 
don ruggles

don ruggles

15 Year Member
Jan 11, 2013
61
4
8
Dec 20, 2021
#2
  • Dec 20, 2021
  • #2
Has a #3 engine miss code now. PO 303. Bought a coil pack. 101 K miles on old one.
 
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