Before I replaced anything the car stopped idle surging for whatever reason. I didn't do anything other than taking off the intake hose and putting it back on. However that didn't fix the car from messing up when I drive it it still does the same thing. Also I should mention I tried to continue...

No.I got a after market exhaust manifold because the stock one was cracked really bad so your correct thats probably why it meltedNo. The gauge doesn't work thanks for bringing that up. Also It's weird when I was letting the car warm up it didn't idle surge its weird because I had it running...

Found where that wire goes I have no idea what it does though (see image). ISC isn't moving in and out its only shaking side to sideI disconnected the air intake and it just stalled. I took off the intake hose and looked at the air filter it all looked nice and clean

Charcoal canister hoses look good. I did some testing on the MAF it seems good. Your correct there's no codes on it. One more thing I just realized when the car broke down it was after driving on a washboard gravel road so maybe something just got rattled lose.

Sorry for the late response. Yeah the car is unusable. I found the ISP isn't working correctly but think that will only fix my idle surge. Other thing I looked at are PCV valve. ERG they seem to be ok

It's very scratch up. And it is a federal emissions

It will stop idle surging when you apply throttle when I stop applying throttle it will idle surge again. I'll look more into open and closed loop because it definitely sound like that's a problem I'm having. And the idle surging was happening before I got the ECU I was hoping for that to fix it...

I looked around for disconnected sensors and didn't find any. But I found were the o2 sensor plugs in its melted not sure if it's a big deal or not (see image attached) And the rpms go from 1300 to about 1400-1500 rpms. and the engine is still cold at that point. And the rpms being at 500 only...

The previous owner (the only owner other than me) kept it in a garage when he was actually driving the car. when he stopped driving it he parked it in his driveway on blocks and put window covers on it

The sticker is very scratched up put it appears it's daytona blue

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When I start my 1990 Plymouth Laser it will idle normal for about 3-5 minutes. Then the idle speed go's up and down constantly. If you try to drive it with will be running about 500 rpms even if you foot is all the way on the gas. And it will nearly stall. If you turn the car off and back on you...