I agree with airpacker about the poppet's sticking. I have run
into this numerous times causing a flooding condition & a
rough idle on cold starts. I have to mention though that in
99 vortechs they no longer use spiders. The injectors are now
individual & run about $80.00. GM has a tsb out on this problem
and claim the poppet's can be cleaned but you need to apply 150 lbs
of pressure. (special gm tool)

I had the same problem with my 6 litre, 99 2500 4X4. I took it to three dealers and each one said something different. Finaly when it died on one of the service managers at a stop light he agreed to reprogram the computer. Didn't help much and that was 2 years ago. By the way, what is the difference in the new 340hp 6.0 litres and my 300hp 6.0 litre? Can I buy a new "chip" to get more HP?
Thanks,
Ted

hey gofast, if you are refering to the 345 hp 6.0 in the caddy trucks, then no, they have different cams, pistons, and i belive heads to gain the power, a chip wont do it. I already checked into this.

actualy the 345 6.0 motor bumps the compression up
making it so you have to run prem fuel use same heads

Have you guy's heard, (or tried) the HP Mass Airflow Sensor? They advertise them in Jeg's. I think they are manufactured by Granatelli Motorsports. $300+ I think. They say it takes 10 minutes to install. 15% HP increase. What do you guys think?

Ted