'86 2.5 feels like it's starving for fuel ??

[shawn]

cleaned out with gumout, new tank, fuel pump, fuel filter. air cleaner is good.

it's been very low on power -then the next day is good again - then the cycle repeats itself every day or so. idle changes too.

????---all help greatly appreciated.

[mnkyboy]

How old is the o2 sensor?

[cz777]

please don't laugh but this alcohol in the fuel as been a pain with o2 senors ,injectors too plus some intake gaskets ,fuel pumps etc in other words hell on the where fuel touches...

[Pete M]

have you tried watching the fuel spray pattern on the fuel injector? done a general tune up lately?

[shawn]

did all of what i had first mentioned, plus plugs and wires. thought i had solved it with the wires but it came back today. not looking forward to trying the 02 sensor this month due to its high cost.

[shawn]

plus 3 other things:

- sometimes it seems to do it when its been driven a long ways. it will just suddenly lose power. but will continue to run fine at low rpms ( and idle fine).

- quite often the idle speed will continuously change. -but not all the time.

- the heater only blows from the defog vents. ( vacuum leak?).

[Pete M]

if the heat only comes out the vents, then you likely have a vacuum leak. that's where I would focus my efforts since it could cause engine issues also.

[brdhntr]

sounds like a vacuum leak that may be from a loose, not broken, vacuum line. another thing, it could be a bad coil. if the coil is bad, it can be affected by heat, vibration, etc, that can cause a intermitent problem. if you want to replace the coil, just buy an accel rather than oem. the oem 1 will cost more and puts out less. the accel coil can be had for 30-45 bucks.

[shelbyluvv]

Sounds like a bad MAP sensor to me.