I need help with a light throttle problem. When I am cruising at part throttle the car will stumble and hesitate. If I then apply full throttle it will snap out of the stumble and surge forward. Any ideas? Please!

Engine:
'94 GS-R
USDM Type-R header
Stock GS-R intake

Service:
60K service
Plugs
Cap
Rotor
Wires
Fuel filter
PCV replaced

Thanks in advance.

 

I had similar symptoms. Most noticeable at 25mph in 3rd gear. Stumbling, surging, etc. In my case it was a worn out O2 sensor. BTW, the cheap generic Bosch sensors didn't work well for me. After two of them I went OEM Honda. Been fine ever since, and that's about one year now.

 

where u getting a cel for the o2 sensor when it was worn?? I have a similar problem too but i dont get a cel for the 02 sensor!

 

sorry forgot to mention that one... it is a brand new O2 sensor!... I think it may be the fuel regulator. I just ordered a fuel pressure gauge. So I will test that when it comes in.