I picked up this sentra that had been sitting for a year and didn't run. After using a scan gauge i found a few codes i dont remember the third but we got a p0180 and a p0335. As far as i can remember the p0180 was a fuel temp sensor and the p0335 is a crank sensor circuit A malfunction if I'm right... Then we replaced the crank angle sensor and the car ran woo!!! Sadly when we went to drive it, it wanted to die if you dint give it any fuel after it warmed up it idled fine around maybe 800-1000 rpm. While we took it for a test drive we found out that it lost power and started jerking back and forth sort of like it was bucking... It also misfired once. We came back to it within the next few days and started testing the spark plugs which were all new. When we pulled them three were black and one was clean. We found out it was a bad coil by swapping two coils and the clean plug turned black. Plus the car did not do anything when we pulled the wires going to the bad plug...
so we replaced that and the fuel pump assembly cleared the codes and the check engine light went away... for awhile... we checked it again and we got the p0335 code again... but the car still runs 
After we changed these things and test drove it for awhile it ran better on all four pistons until you go past half throttle just like before... So i will give you a list of what the guy said he fixed/changed when he was working on it...
new plugs
changed fuel pump*
changed cam angle sensor (1)**
changed fuel filter***
he said he was getting fuel but no spark
*we looked at the fuel pump and it looked new as far as we could tell so we used it... i don't know how to tell if it was new...
**we pulled both cam sensors one did look new the other looked original so we left them be...
***this has not yet been confirmed...
so anyone have any advice?
