I've been helping this guy put new intake gaskets and timing chain in his truck. We also did the cap,rotor,plugs, and wires. Well, it runs but has no power and is alittle shakey at idle. We went over evrything on the ignition and checked the that the chain was put on right a few times. The only thing I can think of is a bent valve as the chain had jumped 4 teeth. What about bad injectors? He's had that happen before............