cold days it sometimes mean there is a vacuum leak on one of the rubber fittings/seals. It would be hard to guess. I would check all the intake places where there are rubber tubes/seals, etc. Look for
...hard the engine revvs but there is power loss the tranny shifts fine (service eng soon) had it scanned trouble code (p0404)fault in egr position sensor (probable causes) 1failed egr position sensor ...
...Cold winter day, worked fine, as soon as it got warmer, or hot out, it would quit, and re-start 20 minutes later and go for a distance then die again. If I parked in the shade on a hot day, I'd ...
...hard to start when cold Vacuum hoses checked It would help to know what yo are working on, but could well be the idle air control motor is dirty and not closing properly. Does it crank over slow ? ...
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