Engine fires right up when cold, but needs to warm up for 2 minutes or else it stubbles and hesitates. Something is not kicking in to richen up the mixture. This wasn't too bad in the summer, but will become a problem on cold mornings. Otherwise runs fine.

I have a multimeter to check the water temp. sensor. I understand it can also be a fuel pressure problem. I don't have a pressure gauge but is it easy to do following the service manual? I'd like to isolate this before bringing it to the shop.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma