Ok so here's the deal: bought a 2002 Sierra with a 4.3 and a 5spd. I've done spark plugs, wires, cap and rotor and fuel filter. And my long term fuel trims are around +10 with a 14% throttle position. Fuel economy is around 15-16mpg. I did check my PVC hoses and they are well attached. I'm using and Altra-gauge for all my figures. I'm going to verify fuel trim readings with a tech2 from work. I have had the Altra-gauge in my alero for about a year and seems very reliable. Is these fuel trims normal or what?