A rough test can be performed for fuel distributor operation. Disconnect the metal hoses coming out of the distributor (may need to loosen the injector side as well). Car is off for this test. Remove the fuel pump relay and short terminals 7 and 8 of the socket (this starts the fuel pump). On the relay the corresponding pin numbers are 30 and 87. When the air sensor plate is all the way to top, no fuel should come out from any of the outputs of the distributor. Now as you gradually depress the plate, equal amounts of fuel should come out from all the outputs. if any of these two does not happen, need to replace the distributor.
There are other more elaborate tests described in the manual, but they need special tools and the documents are large so I cannot post them here, need to send me an email at
saumil@swbell.net if you dont have the manual and need the documents.