caj600ho

I have a 94 sierra 350 TBI, since i've owned it, about a year, it would sound like it loaded up slightly when i would give it about 5% throttle. If i was just moving it around the yard it would sputter at about 1000 rpms or 5% throttle, and die down to nearly any rpms when i let off the throttle. I replaced fuel filter, no diff. I recently changed the 02 sensor, expecting it was it, but no, it made it much worse. now it surges when it idles for about 30 seconds. and dies. no Check engine light on.. I drive it down the road, and hold it at 15% throttle, about cruising speed, and it will slowly die off in rpms, to 1000, for a couple seconds, and spike right up to 2500 without changing throttle position. It will do this continuously. I've replaced coolant temp sensor, and map sensor, also, checked throttle position sensor, checked IAC functionalitiy. Also changed plugs today. Fed up, dunno whats wrong. Someone help me.

pureevilkustoms

I am having the same issues.... someone please help....

jmack91z28

I know this doesn't narrow it down much, but it sounds like it could be a fuel issue. So it's done this since you bought it? Have you checked both of the fuel injectors?

maxbencher

you should check the fuel pressure with a fuel pressure gauge. Available at az, or or