When the car act up like thant and don't want to take gas when i floor it on the high way and i come to a complete stop it stalls, so i restarted it and the engine shake like crazy because two cylinder is not working so i open the hood to see if the catalytic converter is glowing, but it's not. For the cylinders to work now i have to disconnect the battery terminal for a few and connect it back and the car will give me another 20 miles and then act up again, so i wonder if it was the catalytic converter it wouldn't do that all the time regardless disonnect the battery or not right? I will definetly tried the IR thermometer test, because you never know. For the IR thermometer test i have to take the o2 before the catalytic out and stick it there right, get the temp, and after stick it in the muffleur and compare the temp correct? If it's higher before the catalytic converter that mean the cat is no good right? And any suggestion where i can get a good IR thermometer. Thanks

DIsconnecting the battery will clear the memory so that the mechanic can't get good codes. It sounds like some sensor (eg O2) takes 20 minutes to "correct" itself into a bad condition. Taking scanner readings right after battery reconnect and then after the misfirings restart should show which sensor has the different reading.

When the car act up and i checked it with an obd2 i get code p0300 random multiple cylinder misfiring and when i check the freeze data i remember getting long term fuel trim -100 don't know what that is

The car was at the mb tech for almost two weeks and he called me today and told me that he found the problem to come to the shop. I had a problem removing the crankshaft position sensor that was a small piece that broke in the transmission and i dig it in and it felt by the flywheel damage the side of the flywheel where it's suppose to touch by the cps. The tech told me that was the cause of my misfire so he's replacing the flywheel and changing the cps sensor, so i was wondering if that could really be the cause of my misfiring from cylinder 2 and 5.

PROBLEM SOLVED
 

Thanks everyone my problem is now solve. The problem was the flywheel that was bent from me removing the old cps sensor out that was broke in the transmission. I hit it and i mess up one of the flywheel thing that control coil 2 and 5. Now all the ignition system is my car are new now. That thing cost me alot of money i hope the car last me a long time. What i have to deal with is the transmission that is acting on first gear now.

sakpase, it's difficult for me to believe you bent the flywheel trying to remove the CPS. The starter motor likely produces more stress on the flywheel each time the engine starts than you could generate attempting to remove the CPS. I would like to see pictures of the damaged flywheel.

It's not the flywheel teeth that is bend. The flywheel have 3 sides on it that control by each coil. The fact that the cps sensor broke. I had to removed the oil filter housing and the air intake and i hit it the broken cps down with a long screw driver with a hammer unfortunatly one of the 3 sides on the flywheel that is reading by the magnet on the cps sensor bend a little it, because one side was up right under the cps sensor. I'll post a pic with a the broken cps sensor so you could see it.

Glad to hear you got it fixed. It should be good for another 10 years now with all that was done to it.

If i will be good for another 10 years i wouldn't mind spending almost $2,000 on it. And now i have to deal with the transmission that is acting up on first gear now, beside first gear all the other gear are fine.