I have a 1988 OMC 4.3 (Model 434APRGDP, also a second sticker with model 985269??). with a 4bbl Rochester Quadrajet. It starts and idles great, but won't go over 2000 RPM. It starts up and idles fine up to about 1800 RPM. Will get to wide open for maybe 5 seconds when cold though, then...