Originally Posted by Austin Yates

I am also having erratic timing issues. Unplugging the sensor that most have been referring to as the knock sensor clears it up to where the miss is almost non-existent. All the parts listed in previous post are what I've replaced. With sensor plugged in. When i first start the truck it idles high as most do from initial start up. Runs smooth. Drops rpm to its normal operating idle. At this point sometimes itll idle for a bit sometimes it will immediately start to choke. The length of time is never the same. Then like i said it chokes like u pulled a main vacuum line. Idles down rough like it wants to die. Im assuming at this point the sensor is adjusting timing and it idles up fairly high stays there for a moment and slowly drops back down to regular idle. Theres a intermittent "puh" sound. Like when enunciating the letter P. Then it repeats the process all over again. Almost dying then smoothing out almost dying smoothing out on and on no matter the temperature. Its not a until it warms up thing its not a once its warmed up thing. The amount of time it idles good after initial start is never the same and the amount of time it struggles to idle correctly is sometimes short and sometimes it takes it a minute. The time it runs smooth after its little fit is almost always different also. Im perplexed to say the least and about ready to be done with it all together.