well my truck has had a cylinder #2 miss fire code that has gone away on its own...then it started chugging/miss fire on start up (sound like it flooded) but would clear up with in a few seconds...now it started surging under load at half throttle and pings every once and awhile (only drove 2 days like this )...well i checked live data on way home from work and my tps always reads 12 to 21 percent evan if wide open so i figure tps is bad but i also noticed the spark advance was jumping to 45 when cruzing is that normal and could there be some thing else wrong ? thanks

 

What year is your truck? What engine?

 

Could be a spark plug, coil pack or the TPS.

 

its a 99 4x4 3.9 engine...also it had a tune up about 3000 miles ago ..plugs, wires, cap and rotor....it also has an accel coil that previous owner installed

 

timing is based on TPS, IAT, and RPM. Yes 45 is normal. replace the TPS

 

thanks for responses i installed new tps and shes running good other than the weird mis/chug when first started after its sat

 

You might have an injector leaking/dripping or locking up, causing a momentary rich or lean condition at start

 

ok thanks ..i acually have 1 new injector that i bought when the miss fire code popped up but then i thought to my self dont be a tightwad replace them all and im just waiting on them to come in