Hello noob here looking for some help i have a 97 d21 with the 4 cyl and it idles like it is a diesel with a lope tune or a big v8 gas with a huge cam but when you accelerate it runs totally fine. Any ideas or anyone else have this problem? From what i can find it can be the idle air solenoid or injector or a vacuum leak on the egr valve. Just wanting some input before i just start tearing into it and buying parts. Thanks in advance for any info