On borad computer acts eratic - 1991 Lincoln Mark VII

A bad Coil , ignition control module , crankshaft position sensor ,no voltage to the ignition system ! No Start No Spark Cranks OK GMC Jimmy S10 Blazer

Could be fuel filter.

Some vehicle do have a filter at the end of the ventline and must be replaced.. aslo can cause fuel guage to act eratic as the tank vacums when driving.. can be the case if you travel dirt roads lots..

the fuel pump is inside the tank and i have seen trucks that the pump wiring harnes inside goes bad! when you turn the key on you should hear the pump running,if not i bet it is the wiring inside

vice versa.. speedometer started acting up and caused the abs system to disenguage... eratic speedo replace the vss....vehicle speed sensor on transmission

you need to get transmission flushed..or check your transmission fluid. also get your injectors cleaned. the oxygen sensor is probably acting up.

1993 Lexus LS400 wont idle but will run

Sounds like you have a vacuum leak somewhere causing the engine to flood.Check all hoses coming fron intake manifold.

check battery voltage it should be 12.5 volts.if all is good .you have a bad starter or starter solenoid switch.i

motor mounts need replacement and sounds like your cars comp. is about to take a hit and go down
the air flow control unit sounds like it also has has a clog in it and needs to be serviced this is a big one when you get to driving at higher speeds the fan turns off and the air outside controls cooling air/fuel mixture rate sometimes too much air intake can make the vehicle act eratic