1997 yukon problem

I need HELP#$%^.

I've got a 97 yukon 5.7, I started getting a p1345 code. I changed the cam and crank sensors and checked all the wining. The 1345 went away for a while then i started getting a cam sensor code. I replaced the cam sensor again and found a crack in my distributor housing. I changed the housing and now it's giving my the p1345 again. I've tried to adjust the cap without any luck. I've checked it for TDC. I lined up the mark on the balancer with the "V" on the timing cover and made sure the rotor was pointed at the "8" mark on the dist. housing. It startes and seems to run down the road fine, but i can't get rid of the code. Any ideas would be appreciated.

Thanks
Joe