Misfiring

[DrewB]

So my rb20 started to misfire badly when warm, I changed the plugs and that fixed it for a few days but now it is misfiring again.

Could it be the coil packs? Any ideas?

[DarkCaporaL]

Find out which cylinder is missfiring by unplugging the coils one at a time when it's running. The one that makes no difference is the cylinder that's not firing.

Then switch out that coil into another cylinder and see if the problem follows it. If it does then that coil may be on it's way.

Clean your MAF and check for vaccum leaks while you're at it.

[bobbo]

If you notice it more when warm it is likely your ignitor. Common problem.