hey guys I have a 95gmc jimmy 4.3 cpi w. Tonight I was driving and all of a sudden it started to idle rough( a low surge though @ 700 consistent up and down to 800rpms). Then as started to drive more it felt like it was missing in the lower gears and especially no power going up hill!!! Also as I'm driving up hill with no power the check engine light came on. Don't know if this is relevant but the heat seemed like it was blowing less from the heater. Just tuned it up with delcos. Any help would be great!!

 

Start with a fuel pressure test and let us know what the pressure gets up to when the pump is running as well as how long it holds that pressure.

 

im going to check the pressure first thing in the morning! also to i just did the tune up(plugs and wires) this weekend. ran fine for two days after then this tonight. just checked all the connection good nothings lose