still working through the issues with the 89 Formula 350 I bought a couple months ago. One by one I have been replacing pieces. So far, new MAF, TPS,and IAC. Now it starts and idles at least so I was able to set the TPS and IAC. Sits and idles good at 700 to 800 rpm. When I put it in gear and head down the road it has a hesitation when I hit the gas. It also sputters and will occasionally backfire through the plenum. I have checked fuel pressure and it's good and holds pressure when engine is turned off. Tested the injectors and all 8 show 16.2 to 16.8 ohms.

Whats left that I need to check? Any thoughts?

Thanks

 

sounds like the intake manifold is leaking. Mine did that. hesitated under throttle, acted like it was missing or not getting the correct fuel mixture etc.