99 chevy suburban 5.7 206k mile. P0300 and p0306 codes. Light will come on for a day and then go back off. Ive changed plugs wires cap rotor. Intake gasket was done about 5yrs ago. Spider injection done about 8yrs ago. Dont have any drivabilaty issues even when the light comes on. Thank you for your help. Love your videos. Ive learned alot by watching. Thanks.
The tbi in those are common issues. (The spider)
I do believe these also have issues where the intake manifold gasket blows out and can cause misfire and other issues.
@cjbman
The lower intake was done about 5yrs ago. Could it be the upper. That wasn't done.
Yes because I think it will change how much fuel makes it into the combustion chamber. if there is too much air it won't fire. Anything under vacuum is important to keep sealed.
@cjbman
Ok ill try and do the upper and see. If not ill have to get someone to do the lower. Thanks for the help.