just recently i put a new engine in my 32 it was an rb20 with bout 70,000 k and it was a weird idle in the mornin it will sit on bout 2,000rpm then when it gets warm it fluctuates between bout 1,100 and 2,000rpm a mate said it was a sensor and i hve replaced teh o2 sensor, throttle position sensor, water temp sensor, afm, and teh 1 under the throttle body and its still does it and its really startin to get to me ne help would be great thanks