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There is no check engine light on and it hasn't been on. This did not just start occuring. It was happening before the engine swap. Last night we were cleaning the car and I had my daughter turn the engine on and then turn the air off and on. It did not do it then....maybe because the computer was in open loop and the car wasn't warm?
Also, I did notice that the car does not pick up the idle when the air is turned on. I thought that it should do that.
Oops I think I sent you the same message again. the first engine did the rough idle think before the head was cracked. She overheated it because a fan switch was bad. It occasionally just idle rough and felt like it was going to shut off. It also did it when the ac was turned off.
When the engine swap was done the engine did not idle rough and it ran fine. It does not idle rough now.....except on occasion when she stops at a light. She just pulled in the driveway and I went outside. When she turns the AC compressor off the idle drops way down and the car shakes...not quite stalling out.
the engine we swapped had all the sensors on it so we used them. We didn't swap the intake because the engine was complete. So, this thing is doing what it did before the swap. I haven't checked out the vacumm hoses. Should't it pick up the idle when the ac is turned on? Could it be the computer?
Found a code in the computer p1298 fuel air mixture
Also, what tells the computer that the ac compressor is on. It does not pick up the idle when the compressor is turned on. Does the switch on the dash that you push to turn on the ac compressor also tell the computer that the compressor is on?
No vacumm leaks and fuel pressure is good
Thanks a bunch.......I will get the part tomorrow and see what happens. I'm assuming that I can do some kind of electrical check on the part to see if it is actually bad. So, the computer is not the culprit?