Check the pcv valve(located between #2 & #3 intake runner on the intake manifold. These are usually overlooked on a tuneup and will cause a terrible idle problem.
Other things to check is the intake gasket. Using a can of carb spray *Carefully* spray around the intake/cylinder head area. Be very careful when you get close to cylinder #4 because your close to the distributor!
If spraying around the intake and carb area improves the idle, you definatly have a leak... if not then the problem is in a different area (plugs, low compression on one cylinder, etc...)
Let me know if carb spray helps
You could always throw more rice at it.. im sure it will be happier LOL
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piston@zkast.com
'71 LWB
350/350T, PS/PB
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Garrett - Olathe, Kansas