I replaced the relay with a Volvo relay out of an 89 740. Since my post, I took the relay cover off the relay causing the problem. There was a little icicle (a skinny growth on the contact) which measured no resistance on my ohmmeter (very low current) when the contacts were closed but the contact area (the icicle) was so small in diameter that with only a few milli-amps I am sure it would drop considerable voltage and the resultant current to the fuel injectors would be reduced (ohms law says current=voltage/resistance) since the circuit resistance would be increased.