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Smoke at startup - Runs terrible when cold


trymes

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So, I noticed recently that I am sometimes getting some black/grey smoke at startup (not blue). Then, last night and this morning, when I started the car, it ran like a bag of turds until it warmed up. It would start, then die unless I revved the engine up to 2000 RPM or so. If I put the car in gear it will stall when it is really cold (just started). It gets progressively better until the car is warm, when it seems to be more or less normal-ish.

It isn't cold here, maybe 60 F (16 C).

The prior owner mentioned having swapped the cold-start injector with a "good" used one. Is there a good place to start testing this?

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