speedtigger

iTrader: (16)

I have seen too lean and too much timing do that too. But I am with you on the vacuum leak. Or butterflies not fully closing.

Alienlefty

I have spent so much time with a tube in my ear looking for the elusive vacuum leak that I am in danger of sucking my brains out.

I took the pill out prior to making changes on the laptop.

I took the car out again last night, took my 13 year old daughter to the School Prom. It is still set up with the map curve zero'd. The idle is finally stable and under 1000 rpm. The only way to stop it jumping around on the green dial was to zero the map curve. If there was a vacuum leak, wouldn't it still be affecting the idle regardless of map setting?

Pop N Wood

iTrader: (1)

Yes, one would think a vac leak would be noticeable in the idle. Get a can of starting fluid or propane and start spraying that around all the gasket seals and carb throttle shaft bushings. The idle RPM will change when you spray it on a leak.

Is the car noticeably missing when the timing zeros out on the dial? That could be just a software glitch or maybe the MAP sensor is bad. Is the MAP pressure jumping around at all? It should be nice and steady also.

Also can you post your timing curve?

S10xGN

iTrader: (11)

If you have access to a wide-band O2 rig, that would determine if it is a leak...