questions about limp mode

[Sterling]

I have a 2002 3.0 with 102K on it.

3 times in the last week, I've been sitting at a light waiting for it to turn green. When it does and I step on the gas there is an immediate loss in power, followed by the ABS light and the one right next to it in yellow with the triangle in yellow as well. If I shut it off and restart it runs fine but the abs light is still on ... if I park it and wait about 15-20 minutes its all good.

all 3 times it was around 90 degrees outside.

my check engine light is on all the time due to a leaky seal on the top of the gastank. I can clear it with an obb2 reader and it stays off for about 100 miles....

any ideas on the running and limp mode?