325is idle rough

[Groberti46]

my buddy bought a 1987 325is this last summer and it just sat through winter. it starts right up but idles very rough was wondering what it could be it ran fine before winter when he bought it in the summer?

[UlrichFennec]

Vacuum leak is generally the issue. Check your Idle Control Valve, clean it, and then check for any vacuum leak if it persists.

[Groberti46]

e30

thanks man ill clean it out and check the vaccum hoses

[Groberti46]

e30

some of the cylinders are not firing . icv is cleaned and hoses look fine

[Das Delfin]

check air filter, distributor cap/rotor, spark plug wires, fuel injectors in that order