My 5.7 is running rough

[j.serkowski]

I have a 99 4x4 with a 5.7. i was diving last night and the service engine light started flashing and it developed a miss, like 1 cylinder wasn't firing. It limped home and i put new plugs and wires in it, cleaned the cap and rotor with 320 grit and it's still not running right! I was wondering what my next course of action should be. it has 153000 on it with an MSD coil, I checked the spark and it's yellow, should i change the coil and or ignition module? New cap and rotor....distributor?

 

[Bigbill]

Did you check fuel the injectors are known for going bad and there is an updated replacement

 

[Jounier11]

:welcome: To the forum go here i think you will get more help this area is for your OBS(Old Body Style) tahoe:http://tahoeforum.com/forumdisplay.php?f=11

 

[j.serkowski]

No I haven't checked the injectors yet, don't u have to take the intake off?

 

[Jounier11]

yes you do and it is a pain in the a** here's the link for directions BTW it's a sticky:http://tahoeforum.com/showthread.php?t=525761 Good Luck

 

[20Tahoe12LT]

:welcome:

 

[Bigbill]

The link is to pull the entire intake not the upper plenum which is not that hard but you can put a fuel pressure gauge and see if the pressure is at spec and if it leaks down with out any trouble

 

[j.serkowski]

Well, luckily, I was able to replace the cap and rotor with excellent results. It's all good for now , just a simple tune up. Thank everyone for they're input though.