My 1988 Alfa Romeo 75 3.0 V6 hasn’t been running for around 5 years and we’re struggling to get it working.
It starts first time and runs. However, it sometimes runs rough at idle (more often when cold) and cuts out, with a simultanous rattle from around the back of the car as the revs are dropping below 600RPM. It can usually be saved by applying throttle
When you apply full throttle, there is a pop from the engine and a sudden lack of power, throwing you forward in your seat.
New fuel pump (old one was making a loud winning noise) - this didn’t solve the issue
New fuel filter
New spark plugs
Distributor cap & rotor cleaned (scrapped off carbon)
Brakes & clutch bled
Most of fuel drained, filled with fresh fuel