The car didn't fix itself. For the past month I have been having similar issues. It takes forever to start then idles at 480-520 rpm and will die as soon as I put any throttle for about a minute or so until it warms up. It then idles at the same speed and can bog down while trying to pull out of my driveway. After driving for a few minutes, it won't bog anymore but still idles low.

I have replaced parts but I have no clue if the replacements were any good, they were off of my parts car. It ran better than this engine ever has but it hasn't ran in over 3 years. First thing I replaced was the CIS coolant temp sensor, didn't change a thing. Last night, I changed the fuel accumulator (nasty job having 3 year old gas gushing down my arm) and it seemed to idle better when hot but when the engine was cold the morning (I changed it with the engine hot last night) it started exactly the same way as it has been for the past month.

Any ideas? I'm probably going to try to change the fuel pressure regulator then check the idle air control valve. I'm going to order a new CIS temp sensor as well.

Is there any way to tell if my fuel accumulator is bad? Or if the pressure regulator is bad? Or what resistance values I should be getting from the temperature sensor?

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.