I took off the stock air box and ran hoes to the maf and modifed the air canester and it made a big differnce but for the last week or so it's been running alittle slow but the car feels stronger then ever and it's not thoughing any codes.

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1987 firebird v6

 

What I need in my 86 Firebird 2.8 was take off the air box all together and attach an insulated piece of tubing to the MAF and pulled that as far away from the engine as possible without having many sharp bends and on the end of that is a conical K&N filter. I didn't really notice a difference until one day I took it off. I could notice a big decline in acceleration and throttle response so I put that back on and it hasn't come off since. It never gave me any codes and the car seems to be running better than ever.