My 93 s10 blazer idles really ruff and i
erratically for the first few minutes until it warms up. It now sound like its going to stall every morning I start it up and black soot comes out the tail pipe onto the pavement but only while its idling rough. After i changed the cap and rotor it idled good for a couple days then started doing it again.Already changed the fuel filter and pcv valve. whats the problem?
Check your thermal vaccum switch, or just check for a vaccum leak in general
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