Choppy idle randomly

lariat 7.3

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Hey guys.
Truck is having an intermittent choppy idle kinda thing going on. Will idle perfect then all of a sudden ICP will drop down to 350 or so and rpms will drop then come back up. Rpms will randomly dance between 1000 and 500 then go back to normal like nothing happened. Duty cycle only increases a few percentage if at all. Going to change the oil and see if that helps it.
Ideas?
 

dmd

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The injector harnesses been checked for burns? I had very strange issues when
mine were.
 

lariat 7.3

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No. I had issues with the main harness and replaced it. That was causing it to short a bank out


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lariat 7.3

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I'll try that. Driving home tonight started bucking just cruising for a split second. Check engine light and wait to start came on then off?

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79jasper

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That narrows it down.
You're likely losing pcm power.
Is your fuel heater plugged in?
Do you have a chip?

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lariat 7.3

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It's ******d. Rocking a hydra that hasn't been touched since it's been installed two or more years ago. Its also taped in

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lariat 7.3

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It's been coming on when a first start it then off after about 2min. Standby for codes. I wish torque pro would actually pull them

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lariat 7.3

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Here you go. Don't know what's up with the 4x4. Haven't moved that switch in almost a year
656feefd84b28b99122bc65388ab2885.jpg


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fastersteve

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Every time I've seen multiple non sensible codes like that, it's been low volts due to a dead alternator or battery.
 
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