rpm goes up and down and car runs bad when EGR temp sensor is plugged in

check for a vacuum leak, use choke spray and if a tbi unit check under the unit first as they blow gaskets there. also if hose going to map is soft replace that.

Thanks for your fast reply, I'm going to check the gaskets right now. I already replaced the hose to the map. But could it also be a fuel pump problem or fuel injection problem. I want to be sure before I start buying and installing these.

check your fuel pressure first it should be 9-11 psi and scan for codes to make sure. also check wires at top of tbi to see if they are broken

yesterday I took out the TBI, the wires were fine but the gasket looked a bit bad, so I use liquid gasket (silicon seal). I live on a remote island, we do have a NAPA deal but the gasket is not in stock and takes 2 weeks to get here. This morning the cars runs fine and the check engine light is not burning. BUT every time I seem to have found the problem the car runs fine and starts running bad within a day. Keeping my fingers crossed it was a gasket problem.
I don't have the gear to check the fuel pressure, but if that would be the problem I would think it would run bad all the time. And my cars runs perfectly fine this morning, even with the EGR sensor plugged.
Before this morning, when I unplug the EGR sensor, rpm goes up and the car runs a lot better
Really appreciating your input here, been having this problem for a few months and your info finally makes some sense!

order the gasket and remove the silicone sealer, it will get into your O2 sensor and screw it up. you'll need the gasket so when it comes in replace it.

Hey hmac300,
Hope you're still following this thread!! I removed the silicone sealer and replaced the gasket. But still when the car runs stationary the rpm goes up and down, not smooth at all. I measured the fuel pump pressure and it is only 2 psi. So probably there lies the problem. I can put in a new fuel pump but I measured another problem. On the wire from the engine to the fuel pump I only get 8 volt instead of 12v. If I change the fuel pump I still have this problem. My question: is it a problem that I only measure 8v and what could cause that low voltage?

Thanks again for your help!

check for a shorted wire touching the bodyframe