i have a 1989 camero rs had v6 now has 5.7 350. i bought the car with motor already swaped out. car ran great for about three weeks then started lobing when hot. i put new wires, plugs, cap, rotor needed to be done also hoping it solve problem but did not. timing is at 6 degrees. has new coil, when scanner was pluged into the (obd 1 ) connecter. the scanner was puling all kinds of crazy number and readings. so any help would be great thanks

what type of induction system are you running? Is it ecm controlled? What code do you have? More info please..

it has efi induction it is ecm controlled

no codes soposaly motor came out of iroc z

what type of efi? We need more info so we can help.. Also how did you check for codes? You mentioned "crazy numbers" that sounds like codes..

its a tpi, crazy numbers i was talking about was(live data numbers) where jumping around like, voltage reading 12 voltz then go down to 8.3 volts , maf numbers were way off, scanner showing i was doing 15mph when sitting in garage. I am useing a snap-on scanner pluged into the obd1 plug. the scanner would not pull any codes from ecm. it would show/say no codes present. nothing in freeze frame.

my battery/alt tester showed great volts and amps .

hmm ok now we know what you're working on, now can you describe the problem in detail?

when i first start the car in the morning car runs great no lobing idels fine. but when car gets hot fans kick on like normal. then after that when ideling car starts lobing (not missing). but when put into gear starts lobing so bad that car almost wants to stall . when car cools off car runs fine agian. no cats on car, loks to be 2 1/2 to 3 inc exhoust no other modes been done to car. motor is stock

I think he means surging (lopeing).
The usual suspects: IAC dirty, throttle body dirty, EGR not closing...etc.