" Engine problems "
 

I´m not a mechanic but I´m enthusiast.
First I need to tell you that I need to import parts because don´t exist here.

1.-My engine idle sometimes is normal and sometimes is higher.
2.-black smoke
3.-my engine shakes on idle.
4.- I don´t have catalizer.
5.- How many sensor have my engine ?
maf, 02
6.-oil presure gauge reads 4 inmediately when start engine.
7.- A/C sudenly cool and sudenly not.

Please help with this
Thanks

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1976 914, 1983 944, 550 spyder replicas

Engine idle could be bad engine mounts. Mine shook a lot until mounts were replace. You could also have vacuum leaks. They would cause rough idle.