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Bad miss under lite accel

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Old Jan 9, 2017 | 11:40 AM
  #1  
reddogracing's Avatar
reddogracing
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From: South Central KENTUCKY
Bad miss under lite accel

my EXC picked up a bad miss when the cold weather broke. Having been down this road with the 350 I ordered all new coils and plugs. No change.

Under lite acceleration it is missing violently. Based on past I say 2-3 cylinders down. If I push through it until it downshifts it will clear out, until the vehicle speed catches up and it will begin again. Very hard to maintain speed I have ot feather the throttle right on the edge of when it begins to hold a steady speed.

Any Ideas where to go next?

Questions?
 
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Old Jan 10, 2017 | 07:47 AM
  #2  
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krewat
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Check for vacuum leaks. I'd also clean the MAF if you haven't already.

Sounds like the computer has no idea how much air is getting into the engine at low RPM.
 
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