Code 21

[ArunIvan]

Hi all. I'm running a 2002 S15 with a F-con V Pro.

1.I have start up problems. When I crank the engine..it takes two to three times before it gets going. More when I start-stop. Idle tends to be erratic till the engine warms up. Cleaned out the throttle body and accidentally adjusted the TPS. I don't think i put it back to the correct position.

2. When the engine is almost at operational temp..It sputters in gear 1 and two. I have to rev above 2k to get the power out. Sounds like a boxer engine.
Check the codes and it reads 21. I'm using yellowjacket coil packs which are 2 years old now..still in good condition.

Car runs fine on full load. If anyone point me in the right direction I would greatly appreciate it.