Originally Posted by falcon

I'm having the exact same problem with my 99 1.6L SOHC.

Only when warm. Mostly if you just drove for a while, got it warmed up. then you stop for a while (let's say grocerie shopping) and when you start it back, that's when the problem arise.

Mostly first and second gear.
I'm guessing all of them but you just don't notice it as much.
There's a definitive lack of power (only when acting up) and that the hard part, it's not always acting up.
I have no clear CEL... but if it acts up for a while I eventualy get a O2 error which makes sense, since one cylinder is most likely spitting pure gas outside.

Changed the cap/rotor, wire, spark-plug, gas filter.
I'm thinking it's a coil issue...

Let me know if you found anything