By control module do you mean the igniter or the computer module? I have been told that the igniter either works or it doesn't (they run under 80 at a VW shop). The computer module(so I am told) rarely fails. I had a similar problem in that after high speed driving the engine would just die and take a few minutes to restart. They traced the problem to two things: a faulty idle stabilizer and a collapsed hose running from the aux. air regulator to the bellows. The latter so I am told will prevent the engine from getting the proper air mixture leading to stalling. If you feel handy and confident, check first that all intake related hoses including vacuum hoses and the intake bellows are sufficiently flexible and sealed. This is vital. Then try running the engine bypassing the idle stabilizer (by attaching the two ends together). Check that all your electrical connections are solid and are making a good connection-scrape away any veneer for a good metal to metal contact. Finally check your distributor cap and rotor for soundness - ie minute cracks, blackened connections. etc. Before you do anything buy a manual - Bentley's is the best but expensive and good luck. DC
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