So I changed my plugs over the weekend with NGK CR9EIX iridium plugs. Afterwards, bike stumbles from idle until the rpm's get up a little. My first thoughts are "fawk, i should have gapped the plugs or maybe the coils aren't pushed down all the way". Tonight, I gapped the plugs and made sure the coils were in there securely. The result... worse than before.
So here are my questions: 1) can the dealer check my coils to see if they've gone bad? or is trial and error using the bike the only way to check them? 2) is there anywhere to buy new coils for cheap? Those bastards are expensive.
And no my coils are not covered by the recall, my bike is an '02. Also, all 4 headers seem to heat up at the same rate. So I don't know specifically which coil/plug combination is the culprit.