2poor2tune

ok so my friends car has been burining alot of oil and has been running good besides the oil burning of coarse. anyway. but when we start the car ()if it desides to start) it just sputters a bunch and dies. somtimes when we giveit a little gas it runs decent but as soon as i let go of the gas it dies out. it feels like its running on 2 cyl. but checked and all 4 are sparking and working. my guess whas the timing belt jumped a tooth. lmk what you think it could be. i checked map sensor and those mainsensors for them to be unplugged but there all good. and rotor is on god to. lmk. thanks