I have a 92 toyota xtra cab with a 2.4 22re motor the engine will crank and idle for a while but when I try to give it some gas the engine bogs down like its not getting fuel or the timing isn't advancing so far I have changed the cap,rotor,wires.plugs and fuel filter they looked ok but everybody I took it to told me they wouldn't look at it till that was done even though everything was fairly new I switched the air flow sensor with a buddies truck and it acted the same when I changed the fuel filter I was getting good pressure so I don't think thats the problem not really sure where to go from here any help would be greatly appreciated.