Originally Posted by xq244+245

Thank you Pierce and Act1292 for your helpful comments. The MAF replacement was done only because of the hesitation when gong uphill above 2000-2250 rpm...I thought that because the MAF controls the air/throttle it might be a factor when the engine is under load (besides, I just paid $17.50 for the MAF including shipping, and replaced it in less than 10 min). I have thought that perhaps the pump--Bosch and all-is noisy and also certainly about the issue with the deposits on the tank having to slowly be pushed through the fuel pump, filter, etc. It's just the fact that the three factors (noisy pump all the time, hesitation only under high load and hesitation under high load only when the tank is less than half full) are combined and still present after replacing so many things that bugs me and my curiosity....