Injector failures are NOT the common...but they are a quick-n-easy repair for a dealership, a quick way for them to make $500.
Sounds to me like a vacuum leak...based on your description of "bad idle, runs fine above that".
Eliminate the simple stuff first:
Check for vac leaks.
Makes sure the MAF plug is on tight, and the wires are not rubbed through/exposed.
REALLY dirty air filter?
When did you lat replace the cap and rotor (or when did you last do a tune up?)
- Brian
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