back again lol, this truck is making me crazy, sometimes it runs great and sometimes not , it feels like its miss firing at times and cutting out ,all my sensors have been replaced , tps,map,o2,iav,coolent temp, the timing was set at 0 with the advance wire disconected,(tan/blackstripe)injectors have been cleaned,tbi rebuilt, when a knock sensor is bad do they just stop working or do they work when they want ? the exhaust is also new from the y pipe back including a high flow cat and magna flow muffler, it idles fine sometimes and sometimes not (high/low) , it takes a few cranks to start it up but always starts, also my antifreeze keeps getting low , its not in my oil and my floor isnt wet , windows fog very slightly and sometimes can smell it , heater core ? dont c any leaks , radiator tstat and hoses r all new (195 tstat), back to the the top ,fuel pump asembly and filter r new , pressure regulater is new , esc ? or knock sensor ? i dont have a scanner , dont know if its throwing codes , engine light is not on , i lost and could use some good advise, thanx jim

 

I think you have just about replaced everything that can be replaced .If those things had been bad it would have set off your check engine light or maybe it's burnt out ? I am thinking your coil or plug wires . Does it do it more when hot or cold ? Also if you look on the web there is a wire in your connecter that you ground and it will run a test on the system to rule out anything computer .