pretty sure i have a spun or lost rod bearing. i noticed the engine had a low idol at a stop sign, 500-600 RPM so i turned off the radio. next shift i heard what i think is rod knock, i puled over and listened to the engine witch sounded fine just low idol. i checked the oil: it was at the L mark but it had oil. i began do drive home, at ~2500 RPM it makes a piston slapping head sound, 5 mins later the engine was struggling to keep idol and when i was taking off from a stop sign it staled and would not start. i let it cool over night and tried to start it the next day, no luck. so now i need to decide if i rebuild the engine i have, buy a used engine, or sell as is for little cash. i have rebuilt an engine out of a 87 supra (7m-ge) but i am wondering what my best option is. one other option is swapping to a diesel engine witch i would like but need to keep things in prospective. any thoughts?