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After chasing this for too long, I've settled on a somewhat simple solution!

I've swapped it all out for a complete 2005 K5 series engine ;)

I changed the front engine mounts on the car and a...

Thanks for the idea.

This K3/K4 series engine only has one set of injectors.

I had them rebuilt RC Injectors. The problem persisted.

https://www.apexspeed.com/forums/attachment.php?attachmentid=103403&stc=1

Aeromotive

with 100 micron Earls filter before the pump.
New Walbro fuel pump. Holds 50# all the time.
...

Thanks for the input David.

I'm resetting both TPS and STPS values.

"It's always the GROUND". I'll check and maybe add a couple to be sure.

Thanks,

I had the wiring harness put on a diet to remove all the unneeded items. That tip over switch got me when I first got the car!

Secondary TPS change happening today or tomorrow.

Thanks,

Yes, 50lbs fuel pressure, constant.

Hi All,

I'm chasing a gremlin in my 2004 GSXR 1000 engine. This is my first stab at a FI cycle engine car.

I acquired this car back in November and haven't had the engine up to speed yet. ...