need some help S4 n/a
 

Ok 1987 n/a, no emmissions, all solid mounts, true duels, ducted cai, sat for a while but i started it at least once a week. Drove it for about 2 months ran great. Untill about a week ago. I left work let it warm up for about 10 mins ran good for about 1/4 mile then the idle dropped to barely 500 rpms. No power at all. Even with the pedal to the floor. Shakes worse then Michael j fox on a unbalaced washing machine during the spin cycle. And my a/f ratio was so lean my gauge wouldnt read. So i limped it home. Next days troubleshoot involved a compression test 85 lowest on front rotor 90 for lowest on rear. Ignition test was good spark in all 4 plugs, testing various sensors (tps,afm) and checking all plugs. Everything was good. So i decided to replace the in-tank fuel filter, and the inline filter. Still no better. My next step i beilve is a fuel pressure test and injector test. My question is am i overlooking anything? Im sure someone has had somethng similar happen. And suggestions or advice is greatly appreciated.
-thanks
Joe

I think you're on the right track checking the fuel injectors. They may need to be professionally serviced.

(I've always had a great experience with WitchHunter Performance)

Wow

yea i'd check fuel system. make sure you have no fuel leaks. first thing i was going to say is TPS. but you already checked it so thats good.

Check compression.

^

Whoops, was difficult to read his post. Still my bad.

Thanks for the reply's. I do apologize for difficult read. I posted that from my phone. I figured it must be the fuel system
thanks
-Joe

I had a similar problem a few years back. I would get about 2 miles down the road and car would start running like crap and die. Your issue sounds very similar to mine it ended up having to do with hotstart issues. I ended up having to cut a wire going to the ECU. Car ran great after that.

Also if your checking fuel injector issues make sure to check the fuel injector resistor pack located under the air filter. Little silver box check it with a volt meter. Ive had that go before to.