Has anyone had this problem before? It recently started once the temperature dropped, so far I've changed the air filter, fuel filter, pcv hose, brake booster hose and imt o rings. Codes are P0171 and P0174 along with CEL and cruise not available.

 

I forgot to add that when The car warms up it Idles and drives fine.

 

next item i would check is the upper and lower intake gaskets.

 

Mine does that literally every time we have cold weather in AL. I let the car warm up 1-3 minutes and throttle it a little. Honestly as all cars need oil circulated before gunning it but I do believe it is more into it than that.

I have codes I'll try to post but I have a laundry list of codes mine gives off.

 

Because it's both p0171 and p0174, and it's cold weather related, it definitely sounds like a vacuum leak. You replaced all the likely culprits but are they securely refastened?

 

Everything seems to be secure but I'll definately recheck, I think I might have over tightened the O rings.

 

you cant overtigten the orings matter of fact you dont even need the bolts, the imts wont fall out. its the orings that seal the imts not bolts.dont check the upper and lower intake gaskets, REPLACE them. past that if it does it..when cold before you start it, take the brake booster line offteh brake booster and plug it so you dont have vacuum leak from thebooster pipe you undid. now start it, if the problem is gone, the brake booster diaphram is leaking and yes you guessed it, you need a booster... but the upper and lower intake gasket are your liky culprit

 

Its a good chance they intake orings are bad.upper and lower.I have a 2002 3.0 litre s type. When the temperature drop,the car would have rough idle and the brake pedal seem to be hard to push and apply brakes. I replaced upper and lower intake orings,IMT orings and checked elbow vacuum hose under intake and the one on the back. Now my car runs perfect.

 

mine did the same thing especially the brake pedal, then it did it all the time, turned out a new brake booster fixed both issues, there's also a check valve between the booster and manifold. I'd try that first

 

I spoke too soon, cold this morning in Florida, the ck engine light blinking and cruise not available light on. after I got it going it started to make like a gurgling sound that came and went even though it was driving fine.....

 

Flashing MIL = severe catalyst damage occurring

Fix it very fast!

(May be blocked already / bad coils / air leak /etc.)