1998 GMC Jimmy gauges shut off then came back on

I was driving my 1998 gmc jimmy and all the gauges went to 0 mph and 0 on the tach fuel went to Empty   but the car stayed running then they all came back on with a check engine light they then went off again and came back on also it seems that my truck has a loss in power as I was sitting at a stop light with my foot off the brake and the truck didnt move and when I went to take off I had to push the pedal halfway down before it took off can u please help me figure out what this is.