Tried the tech board with no help. I have a 93 del Sol w/built B18B (crower cams, JE pistons, eagle rods, etc.). Has 18,000 miles on the rebuild. Had trouble with rough idle and slight miss at low rpms. CEL codes 41 & 43.

Replaced 02 sensor, runs a little better but still have bad idle. Hasn't thrown a code since replacing the 02 sensor.

Pulled plugs and cylinders 1 & 4 are lean, 2 & 3 are normal to rich.

Fuel pressure regulator passes Helms test. Distributor cap, rotor, coil, igniter, FITV, IAC, MAP sensors all replaced last winter. New plugs (1 heat range colder) and plug wires in the spring.

Any ideas on where to look next? Fuel injectors?

Thanks in advance for the help.

 

change your fuel filter do you get a surging idle cause if you do its the fast idle sensor sometimes it gets stuck.