Hey guys , brand new to the Z world , bought my 2007 touring convertible 5AT 2 months ago stock , it now has stillen intakes , invidia catback exhaust and ,,, this is when the problem started I’ve added invidia HFC to the mix , now I have no idea if this is linked to my problem or not but when I put my foot down now the car jerks back an forth really bad , like throws me around the seat ha , not all the time though , mainly noticeable when I go to overtake someone on freeway etc , it just jerks back an forth an then finally catches up an takes off properly , anyone have any ideas ( I’m due to get uprev next week also , spark plugs have been replaced which didn’t fix anything just in case someone says misfire etc )
thanks in advance guys

 

Were these HFCs new or used? If you didn't experience this problem until you installed them then they are likely the culprit, but it could also just be coincidental. Problem is that it could be any number of unrelated parts that may have gone bad around the same time (dirty injector(s), bad sensors, etc.)

Are you throwing any codes?

 

Yes mate I’ve got check engine light , 02 sensor

 

Which one, and upstream or downstream?

And do you know the cell density of your cats? Reason I ask is because on my 04 going from stock to Berk HFC (200cpi) threw a CEL for both downstream O2 sensors, which went away when I installed (non-OEM, but same mfg) new O2s. However, on my 07 using Z1 HFCs (100cpi), I have a CEL for passenger upstream O2, which did not go away with a new (non-OEM, but same mfg) sensor.

 

Stating the obvious. Upstream O2 error indicates a problem with air/fuel ratio-something that might include the lurching. Downstream O2 error happens when cats fall to 96% efficiency or lower. Or oems are replaced. Sometimes the no fouler trick will work for aftermarket cats.

I'd check the air filter, look for intake leaks and clean the MAF with CRC MAF spray.