Question about 1991 Ford Mustang

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1991 ford mustang, misses under 2000rpm replaced wires distributer cap,plugs, checked timing,checked for vaccum leaks,replaced gas filter and fuel pump. when driving if the tachometer goes under 2000 rpms it starts missing, as if it were shorting out or not getting the proper flow of gas.

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Do a static and running compression test. this wwill tell if there is a broken valve spring or a cylinder gettin low on compression. dont use a cheap tester they wont give you an accurate test when running. Learned this the hard way.

Posted on Dec 31, 2012

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If you've recently added (or oiled) a cotton air filter like a K&N, extra oil can foul the MAF sensor causing drivability issues. Most helpful thing you could do is pull the codes though and post them on here, as it could be many things... bad O2 sensor, intake leak past the MAF, failing fuel pressure regulator (my main guess) and others. It'd help if you listed what engine your car has as well and how many miles it has, and if you have this problem under load only or even when it is in idle.
Pull the codes.

Posted on Oct 11, 2011

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