1989 VW Cabriolet electrical question
 

Hi wondering if anyone can answer a couple of questions about relays and fuse/relay panel
The previous owner had "jumped" the red/yellow wires that go to the lambda relay ( from the back of the relay panel) It looks like maybe cause the lambda relay should have five pins maybe that is why it would be jumped?I replaced the lambda relay with a new one. Theoldone had four pins. The new one has four pins. But now I see there is anotherlambda relay that has five pins...[:'(]The car starts but surges. The frequency valve buzzes off and on-when buzzing car is idling great-when it stops buzzing car surges. If you pull on the throttle switch it idles great. Maybe the frequency valve is going? If so has anyone with an old car like mine ever replaced one??
Any help would be greatly appreciated!!:D

thanks,
Jo