Ivan357

can anyone please help with this one all suggestions are much appreciated. I recently rebuilt my engine and i have a check engine light on and it reads the code P1346 variable valve timing circuit range/ performance bank 1 p1126 electrical clutch circuit malfunction it has multiple misfire cylinder 1234 I checked the timing belt a couple of times and its right I have new spark plugs everything checks out but when its at a standstill it idles like a diesel and it sits below 500rpm and when i put it in drive it gets worse shakes the whole car but when its in motion it has no problems what so ever if i apply throttle it runs perfect. please someone help me I'm growing gray hair with this problem. thank you for your support.