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Hmm interesting about the map sensor haven't come across this as a problem yet,mainly distributor replacement.

More then not probable for problem check your bearing in distributer shaft for wear,we have replaced several distributers in these cars,best option used factory,or new factory,we have hadproblems...

Check for corroded connections at plug in and for resistance check power and ground for this item,get a wiring diagram,but heat unit may be burnt out,or crack in connection.

Change ignition switch and key security bolts kind of stink to chisel off though.

Also some had issues with steering lock interface where the cable don't allow key to be turned off with out it in...