Hello everyone,

A little background. I recently bought this truck from a friend of the family. It sat for about 2 years because it had quit running for the owner. I found out that the new alternator that they had installed had a loose connection and wasn't charging.

This will be my commuter vehicle, so I have gone through the truck and replaced a whole mess of stuff.

I have replaced all of the following:

1. All tune-up parts(cap, rotor, wires, plugs, and all of the filters).
2. All belts, including timing belts.
3. Waterpump, thermostat and hoses.
4. Shocks and repacked bearings.
5. Timing is set at spec. 5 degrees BTDC.

Now the issue, when the engine is cold, I fire it up and it runs fine. But, once I give it gas, it bogs down for a few seconds and then revs normally. Once the engine is warmed up, it does not have this issue. When driving, it feels like it may be a little under powered.

I tried a known good Mass Air flow Sensor and had the same problem. I did find two items that were not 100%, the first was the TPS. It had a flat spot at about the 1.2 volt reading. The next was the ignition coil had too much resistance. I replaced both and noticed a little better running, but I still have the off idle bog down when cold.

I'm thinking that there is only two other things that can be causing this. One being low fuel pressure, I haven't checked it yet because it is a pain in the rear. The next item is the ECM being suspect. Of course this will be the last thing that I will go after.

Now, has anyone had any experience with this issue before? Or does anyone have a good idea which way to look?

Thanks for your time and help.