Stalling on idle/slowing down

[Moz]

Hi all

1990 M40B18

Having an issue whereby the car stalls when slowing down and sometimes when idle it will gradually drop the revs and stall. Replaced TPS, blue temp sensor, CPS, ICV cleaned and tested for resistance, AFM replaced, HT leads and distributor replaced. Some of these were done as maintenance. Bought a smoke machine and couldn't find any leaks bar some smoke escaping through the air box but a new filter resolved this, new boot from TB to AFM. Fuel filter also replaced.

Has anyone had something similar?

Thanks

[Contours]

A lot done there. Did you clean the throttle body as this would affect driveability?

[Moz]

TB cleaned, did so when replaced TPS and was moving freely. New plugs, old ones were dark on the tips.

Thanks