Back again..i have an 89 mustang lx and im having this popping noise coming from my intake. I have edl performer heads, edl upper/lower intake, e303 cam for hyd roller lifters, harland sharp roller rockers. I had stock maf and small aftermarket air filter and it didnt have any popping coming from intake with that setup until i swapped to a 76mm maf and bigger air filter. It mainly pops when its cold and it also does it when i start off in 1st etc..going up a hill. Higher rpms it will do just fine. I took it to shop and realized my computer isnt advancing my timing so the guy set initial timing to 21 and told me to run it like that with SPOUT out but it still pops from intake..could my timing not advancing cause this popping noise with the bigger maf? Thanks for any input.