1994 Suburban with 6.5, IP was replaced by shop that did not set IP timing, after setting IP with GMTD scan i get 3 error codes 18, Pump can reference error,35 Injection Pump width error and 54 PCM fuel circuit error. Desired timing at 10.9, Actual Injection timing is 14 and Top Dead Center offset is -0.62. set after it reached 180 degrees, It runs very poorly loads up, if you rev itr up a few times after it reaches temp it will set check engine light and run real well. any ideas would be appreciated. It starts well and has a good wrench engine now. don't know when it was installed.
Need to get it on the road again.