I have a diahatsu s210 that I have had for about 8 years with zero problems til about 6 months ago. truck acted like it was running out of fuel, I could tap on the pedal a few times and it would straighten out for a few minutes then bog down again, tap on the pedal and another fix for a few minutes, after about 5 or 6 times the pedal tap wouldn't make it smooth out anymore but I could turn turn the ignition off then back on with the truck still rolling and it would run perfectly for a few minutes then the same thing again, figured it was about time for a fuel pump anyway so I replaced it, no help. This is what I have done so far: Replaced the fuel pump, steam cleaned the tank, blew out or replaced the fuel lines, installed an inline fuel filter, fuel pump is putting out a constant48 lbs. when it is running good or bad, replaced the plugs, replaced the air filter blew out the carbon filter, checked all the vacuum hoses, cleaned out the throttle body and verified that all the ports were open, removed and cleaned the fuel rail to the injectors, all the coil paks are firing whether it is running good or bad, changed out the computer yesterday morning. No change. These items were done over a 6 month period and there has been no change at all after anything I have done. This is a ranch truck and it makes the same 45 minute trip around the ranch every day without any starts or stops. No check engine lights. It will start easy enough but it's not a smooth idle, but just a touch on the pedal will smooth it out,,, Well, What do you'all suggest?