Hello!
To start off, i have a 99' Legacy 5-speed.
I've had the car for two months, everything was running fine and dandy.
After i got off work on Friday 4/18, everything was fine as i turned it on and cleaned my windows, i drove 1/2 a block and then the C.E.L flashed, i hurt a slight knock with ticking, so i drove it home going under 2,500 rpm and check the codes.
P0301 and P0302, Misfire cyl 1 and 2, week prior i used Royal Purple Max Clean and use 91 octane, anywho... i cleaned the MAF, changed vacuum lines to the EGR system and one hose that connects to what i think is the FPR, check all four plugs, they were all burning clean and normal wear and tear (plugs are a month old, along with wires), the plugs gap was at .044 so i closed them to .040, cleared the codes... then after 7 miles the light starts flashing again and it's the same codes...
Car idles fine and picks up smoothly... doesn't even seem like it has a misfire... only thing i do hear... is a pop every time i shift... Detonation maybe?
Reading all the posts... i assume i should check my injectors next (which could explain the ticking i hear).
Anything else i should check? My dad thinks it might be a vacuum leak elsewhere?