Seafarer12

Ok guys maybe you can give me some ideas to check. It is an 88 pickup, 350, 700r4. I just swapped the engine out of it and am trying to get this truck together enough to sell it. I got it running and it ran good but had a second gear slip. I got a corvette servo in it today and took care of my slip. The problem I am having is if I gun it from an idle it will break the tires loose then it is almost like it dies, no engine sound, no backfire nothing, its like the fuel shuts off. I can either leave my foot in it or take it out and it will come back and run fine alll the way up to 70 without a hickup at full throttle. It just does it off idle and under a load (Pavement) Dirt roads I just spin the tires. I am trying to be cheap with this engine so I don't want to start throwing parts at it unless I know. The truck didn't do it before I swapped engines. I replaced plugs, o2 sensor, rebuilt the regulator while the engine was out. I know my wires are getting weak but it is almost like the fuel shuts off for a second but it will run full throttle up to 70 no problem so I am not thinking it is a fuel filter or pump issue. The engine is bone stock with 5 degrees base timing and free flowing exhaust. Thanks for the help.

ex-x-fire

You'll probably have to increase the fuel pressure, sounds lean.

Seafarer12

Its just off idle though like under 3000 rpm. It will run up to 5000 rpm with no problem. All I did with the regulator was replace the diaphragm and some gaskets. There was no problem before and the old engine that was in there had more of a cam, better flowing heads and more compression. I am thinking it is a sensor of some kind. Its not like on a carb when you have a bog off idle. You can still hear the engine firing there is just a big power loss. This is like a total fuel or ignition shut off. Then it will come back and pull all the way up till you let off.

Seafarer12

Well I got a chance to mess with it a little bit this morning before turning my garden over getting ready to plant. I plugged my egr port, no change. I was going to pull my IAC and chage it with a spare I have and while I was pulling the plugs to my IAC, MAP, & TPS. I noticed my map plug was full of water (don't ask me where it came from) I cleaned and dried it out. I figured I would forgo pulling the IAC and see if that was my problem. The first full throttle from idle gave me a worse bog than I had before but I did it three more times in a row with no bog. It is doggy but it was always like that. My tranny shifts out of first way too early. I guess I would need a shift kit to fix that. If I pull the TV cable any more it shifts way too late if it shifts at all. I will give it a drive this afternoon and see if the problem comes back.