1998 Suburban, with the transmission out, is having issues. I've been running every c
 

1998 Suburban, with the transmission out, is having issues.
I've been running every couple of days for 1/2 hour or so.
After the snow melted, Cj Noticed a spot under the Suburban that looked like a diesel fuel stain in the gravel.
I was going to run it today. It hasn't been run in several days - almost a week - and checked fluids first. The coolant cap had pressure and was full to the cap. The oil was also overfull.
The last time it ran it was revving to wide open throttle for a couple of seconds every few minutes. I thought it was a PMD thing.
I'm pretty sure this is related to the fluid spot under the Suburban

Any ideas?