GMC SAFARI TROUBLE CODE

94 Gmc Safari 4.3 Liters Has Codes 42, 67 I've Changed Ignition Control Module But Transmission Shop Says I Don't Have Power To The Trans...

Had This Gmc(4.3 L) Van Been Sitting For A While, Recently Started It Up For A Smog Test, But Check Engine Light Stays On, Pull The Code...

Just Replaced Head And Did Complete Tune Up And Don"t Know Where To Go Next? Car Has Random Misfires On Idle Updated 2-5-09 Already Did...

Code P0135 Bank1 Sensor1 Location