So I've been driving my a4 and the check engine comes on solid the precious owner told me it's the ignition coils so I changed all 4 of them last night while shifting the second my go began shaking as if it was getting ready to stall but it didn't before changing my coils I I'd go get the code checked out and it was throwing
P0300:
Random cylinder misfire
Explanation: air/fuel ratio
لل Lean air fuel ratio

So this morning I took all of them out and made sure they were connected properly but it's still shaking in idle and shakes while I begin to excelerate I took it to my shop this morning but can please someone tell me what this might be

 

A random misfire isn't due to bad coils- when the coils go, your error codes will be for individual cylinders (ie. P0301,0302, etc.)

I'd say maybe an O2 sensor or MAF might cause a p0300 and some rough idling.

 

sounds like a vac leak. Might check your check valves for corrision or the pcv piping going under the manifold.