How did it go with the cold start injector valve? easy to replace? I have the same issue, (these last couple of weeks of cold weather really have impacted my vehicle).

last year I used 44k, but this year due to limited budget used seafoam in the last tank (current) and it has made a bit of difference (still working on an issue - diff post).

I only use premium gas, but used to only use shell premium and now that they closed the one closest to me, I have been using chevron premium gas for the last year or so.

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89 300E - 240k +