wannaeatyourbrains
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Most usual cause is vacuum leaks. Brake booster, HVAC line at the back driver's side of the plenum, the purge line elbow on the front of the throttle body, bad plenum gasket, bad fittings for the PCV lines on the plenum, or that black Y-piece is cracked. That last kind of crack can be really hard to see. You gotta pull it out, block the end of the pipes and blow in it to know.
Spark plugs for sure. Next most common. You said you checked the coil packs, right?
Then you could look at the injectors. Remove and clean.
Sometimes just the throttle body is stuffed. Can you borrow one from someone to swap and see if it makes a difference?
Spark plugs for sure. Next most common. You said you checked the coil packs, right?
Then you could look at the injectors. Remove and clean.
Sometimes just the throttle body is stuffed. Can you borrow one from someone to swap and see if it makes a difference?