1998 safari

[grego72]

My 1998 safari van with a 4.3 has a no power problem for the first 30 seconds every time you start the engine. after 30 seconds it clears up and runs ok.
Any ideas?

[old_master]

Check fuel pressure and leakdown rate. Ignition in RUN position, engine off, fuel pump running: Pressure must be 60psi to 66psi. Pressure must remain above 55psi for 3 to 5 minutes after the fuel pump shuts off. Post your results.