as regards fuel issue. your fuel pump in the tank could be failing. never run the tank to the bottom. i've heatd of leakining injectors on these models. but right now i'm rebuiling a 2002 1.8 lit., corolla. cusomer just smoked it at 160,000. if the head was bad thats $390.00. if the engine core is unrebuildable than a used, 90 day garut., engine is no less than $1,100 , and then it's still a used engine. plkese rebuild your top -end at around 100,000 miles and rebalance. timing belts on time, and note to you mech. the tensioners fail prematurely,. go to 30,000 replase, not 60,000. and completely rotate out trans. fluid at 70,000 or more. some manufact. specs are wrong , torques wrong, factory quality contrl issues . go with your gut and still aplly old school rebuild ways.. we havn't had a rebuil return in 5 years.. Kraig