pikappkaz

hello , this sasf , my problem is solved with my 99 tahoe, check compression on your vehicle, mine were very low on the misfiring ones, the worse one was only 50lbs,after spending all that money on sensors , fuel pump,injectors,tune up. the vortec heads are the problem.the valves were hanging up from carbon, two were bent, you could tell where they actually hit piston. very bad design. the service bulliten from gm is right, but they wont admit it , now at 105000 miles it is like a new truck, i can cruise up hils at 85mph and it keeps pulling and wanting more . let me know if you need heads , i got new remans for 425.00 deliverd to my door, with a 1 year warranty, thanks scott