venture 99 P0102, P0171, P0305

Hello i´m having problems with my venture 99, i got this codes
P102, P0171, P0305,
i changed plugs, cables, but missfire # 5 still.
i change MAF and no Change.

The problem is the loss of power

any help would be appreciated

Check the #5 injector, might swap #5 to #3 and see if the missfire moves, might ohm it out first. Have you checked fuel pressure yet? If #5 inj is stuck it will show lean and missfire like you have, the MAF sensor code could be from a time it was unhooked or something? Have you cleared codes and seen what came back yet?

Check the #5 injector, might swap #5 to #3 and see if the missfire moves, might ohm it out first. Have you checked fuel pressure yet? If #5 inj is stuck it will show lean and missfire like you have, the MAF sensor code could be from a time it was unhooked or something? Have you cleared codes and seen what came back yet?
Thanks for your reply... im going to do test you suggest and try to identify if the injector is the problem...i´ll post results.

and for the other issue.... by taking off the (-) cable of the battery is enough to clear the codes???
:feedback:

Yes, you can remove the negative battery cable for 60 seconds to clear the codes.