Initially, it would be perfectly fine then start getting worse after 20secs or so. Over the past year though it's morphed into a slight misfire at initial start that then gets worse. There seems to be less "flare" now as the engine catches - used to easily get over 1500rpm as everything fired for the first time, now its somewhere around 1250rpm usually.
It's so inconsistent with how severe the miss gets (and if the car stalls), but seems to be slightly better when there's more than 1/2 a tank of fuel. I am beginning to wonder if it's a fuel pressure/injection problem too
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