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loppy idle! Help!
New engine(long block) has been running great for close to 30K miles now. It is great to have all new , good injectors etc...
Until about three weeks ago. The engine developed a quit lopy idle. Only when the engine is really good and warm/hot. And seemingly when the weather is hot.
Doesn't miss or cut out, and runs great when cold. But, after several miles, when I pull up to an intersection stab the clutch it lopes. You'd swear the cam had 50 degree of overlap. Shifter wobbles, tea glass sloshes etc... A couple of times it even died. Had to let the clutch back out(still rolling) to fire it back up.
No codes/lights or odd indications. If/when I rev it up just a bit it smooths out. High idle(PCM hooked up to upfitter switch #4) idles just fine at 1200 RPM.
No bucking, surging, missing or the like as long as it's above 1000 ish RPM.
Until today. The record heat finally broke, and today she idles real purdy like. No matter how hard or fast I run her she runs fine. WTH?
Fresh fuel, filters, oil, and the EGR stays unplugged so it's clean and closed.
When it's sitting at the intersection lopping, as soon as I start letting out the clutch and hitting the go pedal, she smooths out. Runs like a champ, boost swings right up to 30ish and is steady.
What/where do I need to check or smack?
2006 built 05/05 XLT CC DRW PSD. Captain chairs, sunroof, polished aluminum wheels, 6speed, manual 4x4. 285K miles with 130K problem free miles on new engine.