Help!! 4 Codes came up

[JLindley]

I just replaced my spark plugs 2-3 days ago and the car has been running great until today. While i was driving down the road i noticed a jerky feel while the car was in fifth gear goin about 60 (car was misfiring), Then the check engine soon light came on and sometimes blinks. I stoped by my local advance auto store and had the codes read.
this is what came up.

P0136- 02 sensor bank 1 sensor 2
p0301- Cylinder 1 misfire
p0113- IAT sensor 1 circut high output
P0300- Random/multiple cylinder misfire

I dont know what the hell is going on. My Mechanic told me that he thinks its a bad ignition coil. I replaced that and it didnt work. The other things he told that it could be is a bad injector or a bad gasket in the intake manifold. what do you guys think. please help!
p.s the 02 sensor has been out for a while, i know thats not the probem.

 

[JLindley]

I just replaced my spark plugs 2-3 days ago and the car has been running great until today. While i was driving down the road i noticed a jerky feel while the car was in fifth gear goin about 60 (car was misfiring), Then the check engine soon light came on and sometimes blinks. I stoped by my local advance auto store and had the codes read.
this is what came up.

P0136- 02 sensor bank 1 sensor 2
p0301- Cylinder 1 misfire
p0113- IAT sensor 1 circut high output
P0300- Random/multiple cylinder misfire

I dont know what the hell is going on. My Mechanic told me that he thinks its a bad ignition coil. I replaced that and it didnt work. The other things he told that it could be is a bad injector or a bad gasket in the intake manifold. what do you guys think. please help!
p.s the 02 sensor has been out for a while, i know thats not the probem.

 

[matt0248]

Concentrate on the P301 and P0113 codes. You will need good wiring diagrams to pin down the IAT code. You did not ay what engine you have so I don't know if your truck has a seperat IAT sensor or if it is integral to the MAF senosr. IF it is a seperate sensor it will be easy to troubleshoot by buying a new one, they are pretty cheap. If you just replaced spark plugs check for any loose or unplugged electrical connectors. Also, remove and check the #1 plug and wire(coil pack and boot if a v8). It is possible to have a defective plug out of the box, it happens.

 

[JLindley]

Concentrate on the P301 and P0113 codes. You will need good wiring diagrams to pin down the IAT code. You did not ay what engine you have so I don't know if your truck has a seperat IAT sensor or if it is integral to the MAF senosr. IF it is a seperate sensor it will be easy to troubleshoot by buying a new one, they are pretty cheap. If you just replaced spark plugs check for any loose or unplugged electrical connectors. Also, remove and check the #1 plug and wire(coil pack and boot if a v8). It is possible to have a defective plug out of the box, it happens.

i have the 4.0L v6