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did some one mess around and adjust your throttle stop screw settings?sounds to me like the trottle plate is too closed and does not allow correct vacuum reading ,check to make sure vacuum gauge hose are not pluged up .Try to measure manifold vacuum from brake booster hose if you can. by the way timing supposed to be checked with engine warm normal op temp your engine should be idling around 850rpm with TPS disconnected.Stock factory timing is at 15 degrees, which is the 2nd to last mark on the crank pulley.
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