After I went through most of the EFI (checking areas that could have produced the symptoms of surgeing)... I cleaned connections (TPS AFM thermotime and CSV and water temp) Checked out the AFM and cleaned it up, purchased a new cap and rotor, new plugs and wires and ignition coil. And also adjust the TPS. And to no avail.... One of the things I did not think about and regretfully overlooked was the injectors... what if there were particles perhaps blocking injectors, causing fuel blockage which could cause surges... I went to the store and bought 2 bottles of prestone FI cleaner and put 1 in before getting some nice 93 octane... and WALA, drove the car for about 30 mins with no surgeing at all!

Im very happy right now, I cannot begin to explain...

Thanks for all of your help guys, and to all of the Z community!

AWESOME!!! Glad to hear it! Good thing you didn't dump all that money into buy carby stuff. There's one rule we keep to as ET's in the CG is K.I.S.S. - Keep It Simple Stupid. Yep, they teach us that in school... wonderful for building young egos, they call us stupid

That's good news!

Nate

I have to admit, I missed the fuel injection cleaning as a diagnosis to the problems you've had. I've dealt with the EFI system for some time now and I guess I took it for granted. Now this is not a plug for a product coming up here, just something that works and has worked for me over the years. I always use Lucas upper cylinder lubricant about every fifth fillup in all my cars. Carbed or EFI. Never had a problem. Eight years with the Z and almost two years with the 810. And I use 87 octane! No ping, no surge, etc. I'm glad you've solved the problem. I've always been a fan of the Nissan/Bosch style EFI. It may be primitive by todays standards but it does work!

you know Son, I took the injector cleaner for granted also, I dump a thing of the cleaner in the Camery every third tank or so. Keeps them clean. I just dident think of it. Enjoy the ride. Gary Good luck on the other build , let me know from time to time . Gary