i think im having a miss fire. after i drive for like 30 mins and im cruising in like 2500 rpm and give it 1/2 throttle and it boost up to 6-10.2 psi it breaks up and starts bucking and jolting as soon as it builds up. idk thought someone tell me btw i havent changed spark plugs yet since i got the swap from cfp so could that be why cause it has stock spark plugs? any info will be great thanks im thinking it would be plugs though.

 

Might be a spark plug gap problem. My friend in ATL had the same problem and it turned out to be his headgasket. When his engine warmed up it would buck under full boost, you could visibly see small oil trails coming from his headgasket.

 

yeah probably plugs. check em, since i notice the majority of stock sr swaps seem to run on the rich side, they're probably due. when u pull the old ones, check what gap theyre at. you should be good with .030" gap with a relatively stock sr and your power output, even try .032" since the more gap you can get w/o misfiring, the better.

i suggest ngk bkr7e or 6e whatever teh SR uses stock. theyre like $6 for all four and you can run them anywhere between 3000-10000 miles at a time.

 

Spark plug gapping is your problem.

I'm having the same problem too after i get above 12 psi. I need to check mine's out tonight.

 

i knew it was a miss cause when id get into boost and go about 5500 rpm my boost would start droping ill get all new spark plugs tomorrow and get them gapped while im there cause knowing me ill bend them lol.

 

so do i just tell them that part number ngk bkr7e?

 

bkr7e = part # 6097

 

thanks for the number and i changed the spark plugs and gaped them to 30 now the car is running a hell of a lot better