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I'm thinking that I'm not loosing vacuum... but adding a load on the car when in Drive/Reverse.
I have opened up the TB Blade a litte by adjusting the screw..... IAC's remain pretty high in Drive but the car doesn't stall. However, the idle in Drive with the foot on the brake, still surges/drops, etc. It actually drops pretty low... than "Catches" itself... for a little bit.. than surges.
When putting it back in Park ... the car revs a little while the IAC adjusts... then idles perfectly fine.
Anyone else have this problem? Could it be the 58mm TB. Is it the LTCC ignition system? The car runs great other than this problem.
i seem to remember some people needing to drill the bleed hole larger in that throttle body, the problem was that the IAC couldn't compensate enough, the IAC steps at 160 means it is trying to get more air in there but couldn't
ASE Certified Master Technician
2004 Blazer Xtreme, Indigo Blue
1990 K5 Blazer LT1/700R4/NP241
1989 Camaro IROC-Z **SOLD** MichiganSpeed
What do you think it could be then... it only happens in Drive/Reverse... with the foot on the brake.... if I just let the foot off the brake, the car will move forward... and there aren't any problems.
When I removed the Brake Vacuum hose and plugged it, the problem went away.
It seems that when the engine is under load and the brakes have to "work" to stop the car from moving, at low Idle, the brakes are sucking the vacuum and causing a problem.
I may have to invest in a Vacuum Reserve Canister... but before that, are there any "tricks" to minimize the issues associated with this problem? ie. would lowering or raising the idle in Drive, or changing the timing, etc. improve the brakes and vacuum enough to avoid getting a Vacuum Reserve Canister?