Low and erratic
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Low and erratic
I have a 2004 F150 XLT Super Crew 5.4 3v with 125000 miles. Ever since I changed the spark plugs the Idle is very low to surging. It idles around 400 to 500 rpm's, if you rev the engine it will drop to 200 to 300 then die. it does this when cold or at normal temp. But some days its normal. I It has no codes, I had it on a diagnostic machine and it shows no faults. Was told its the throatle pos sencer or temp sencer. Anyone have any Ideas.
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