Alright, stupid question but I'll ask it anyway. My '90 (TBI, stock, blah, blah) is running funky. Just think it needs a tune-up. Never done it on a fuel-injected truck and was just looking for suggestions on what to change and such. Just did the distributor cap and rotor not too long ago. So what else would you guys suggest? TIA K-5...Soccer moms inquire within.