2003 Nissan Sentra 1.8L P0303

I have a 2003 Nissan Sentra, 1.8L engine. The other day it started shaking when it started up to the point where it felt like it was going to stall. After it got going it went away. The check engine light has came on and its giving me a P0303 error code which is "Cylinder #3 misfire". I took it to the garage, had a compression test done, plugs and coils inspected and everything came back ok... The code was reset however a few hours later the engine light came back on the its shaking again. I've read others with this vehicle having the same problem but I havent read a post with the solution. I have to take it back to the garage just wondering if anyone has solved this puzzle.

I'd have to say the shop you took it to is highly incompetent! It's a reasonably easy thing to diagnose. How do they test the plugs, coils, injectors etc, static compression tests often don't reveal an engine problem. If I remember right those Nissans had a problem maybe even a recall for the coils. If that is the case the shop should know this or else they've never worked on a Nissan in there whole career. either way take it to a different shop or perform some diagnosis of you're own,. Start by removing #3 coil and switching it with another cylinder, if the code changes to a different then the coil is junk. If it stays next switch the cylinder #3 spark plug with another cylinde. if it still says #3 misfire then it leaves either a vaccum leak which is a good possibility, an injector fault, possibley but not as common in my opinion or an engine mechanical issue that the compression test didn't reveal.

Hope this helps and please keep us updated on what develops.