Thread: 99 gtp misfire #1 under load /in boost Heelp!!

93 octane, vac at map senser is normal and boost gauge read the same but will double check all vac lines for leaks

Thanks

ok ive had no luck with anything replaced vac lines with "t"s lower intake manifold gaskets... still no change will throw a p0300 has 120 psi compression..... scratching my head?

any other advice?

thanks