SKIPS WHEN WARMED UP..baffled

[murf]

Have a 86.5 NA Supra with 35K on a rebuilt motor. It started to skip when damp so I put wires, cap, rotor and plugs in. Now it runs smooth on start up, but after several minutes (less than 5) will skip at idle. It also has no power under load. The skip seems to be #4. The car has 200k on it so I changed the fuel filter and fuel pump. I pulled the cold start plug while it was running smooth after start up....no change. I have had distrib pick-up coils build resistance with heat and act like this....so I changed out the distrib. Still no change. Again when it is first started it runs like a clock at idle..but will have a slight stumble when rev'd w/o a load. Any ideas??

Thanks

[Supra Greg]

Well ya need to pull codes... see if you getting any... could be a number of things.. start here

MK3 TSRM On-Line

[murf]

I had checked previously and no codes showed. I listened to the injectors with a stethascope and all have a crisp opening/closing sound through out the RPM range

[murf]

I started the diagnosis over again and found the cylinder that had the skip actually had a faulty plug. It was a new Bosch....but it ended up faulty. Should have got NGK's. Thanks for the ideas