I have a 2006 her with 64700 miles on it. I keep getting miss fire code on #4. new plugs all new coil packs just put in a new air filter and mass air flow sensor. what else maybe a fix.

Thank u I will pass this on to my mechanic. We put a new mass air flow sensor earlier today and cleared the misfire #4 code. When he checked air filter it was pretty dirty he cleaned the air flow sensor when he unplugged the sensor it popped up a miss fire code. So I bought a new one and he replaced today. So far I have drove about 60 miles today so far no code. If it was a internal issue would code be so random

I use shell fuel most of the time I will put there best in with some Techron. I purchased a new fuel injector off amazon last evening. I drove it yesterday 4 separate times and put about 65 miles on it. Without the engine light coming on we will see today I’ll drive it again it rained last night could moisture play a role into the miss fire code after I washed it yesterday I took it around the block and that’s when the miss fire #4 came back on. Thank u for your responses. I really appreciate them. This is for my daughter she is 15 1/2. and a straight A student and a great kid I’m just trying to give her a nice car to drive. Again thank u.