87 S-10 having new issues now. Just started saturday on my way to Disney. "Check engine soon" light came on after about 15 minutes of steady acceleration on the highway. Then the truck seemed to want to die while keeping a constant throttle. No matter what speed I'm going, as long as I'm accelerating in a constant manner the truck starts to jump as if it wants to die. Now if I let off the gas and then press the gas pedal in hard hold for about 3-4 seconds then let off and repeat it will run ok, not great but ok. The light goes out if I keep pressing in and then letting out of the throttle. By the way, this is DESTROYING my gas mileage. Could it be the injectors or a sensor of some sort? Please help!

thanks
Nick